Cumulative Gas Mileage (Gas MPG) Thread
#352
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Originally Posted by legokcen
19.4 mpg since I've had the car. This also includes a track day which gave me 7.2 mpg Hell of a weekend at Road Atlanta. Max was 23.7 mpg. You can't really tell anything from "half a tank." Consistency is several tanks.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
Your track-day data point clearly shows the significant negative effect of hard driving styles on fuel mileage in the RX-8. This is the first time I've seen such hard data that demonstrates that so effectively. Thanks for sharing.
#353
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Originally Posted by MarthaStewart
I pretty much do mostly city driving. So I thought I'd share some mileage numbers with you and see if anyone else has the same numbers.
After filling up with a full tank of gas, and doing city driving I got 88.7 miles before the gas needle reached the half-way point.
Would anyone like to comment.
Thank You.
After filling up with a full tank of gas, and doing city driving I got 88.7 miles before the gas needle reached the half-way point.
Would anyone like to comment.
Thank You.
But I guess they don't let you drive much when you are in jail??? :p
#354
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Originally Posted by legokcen
19.4 mpg since I've had the car. This also includes a track day which gave me 7.2 mpg Hell of a weekend at Road Atlanta. Max was 23.7 mpg. You can't really tell anything from "half a tank." Consistency is several tanks.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
I've been getting about 18mpg avg. on my 8 so far, so you are doing a little bit better than me. I have tracked mpg for every tank I've had on my car so far, but I haven't gone as far as putting the data on a pretty graph... yet.
#355
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Originally Posted by MI_FamilyMan
7.2mpg at a track day??? Ouch...
It was a Panoz event at Road Atlanta. 3rd and 4th gear all day. Seldom under 5K on the tach. Redline every time I went from 3rd for 4th. Hell of a day. Worth every $ spent on gas.
#356
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Originally Posted by legokcen
19.4 mpg since I've had the car. This also includes a track day which gave me 7.2 mpg Hell of a weekend at Road Atlanta. Max was 23.7 mpg. You can't really tell anything from "half a tank." Consistency is several tanks.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
My standard deviation is 2.7 mpg, so I'm pretty much in control. Only out of control was one high (long road trip which was the high) and a track day which was the low. I'm relatively consistent around 19 - 20.
#357
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Let us know when you have some fillup-to-fillup figures, and how many gals you fueled up with. Then we'll have some numbers we can work with.
Typically I put in 13.7gal at a fillup and get around 240mi. That comes to about 17.5mi/gal.
Typically I put in 13.7gal at a fillup and get around 240mi. That comes to about 17.5mi/gal.
#358
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Originally Posted by Paul_in_DC
Ha! And I thought -I- was the only one obsessed enough to make a graphic of my mileage! :D
Edit: Your numbers are actually a little lower than what I've got... I don't think I've ever had in the 14s... I always fill up around 13.5 gallons and am almost always over about 205 when the light comes on.
Last edited by Nick; 01-08-2005 at 12:59 PM.
#359
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Ha ha ha! I'm glad I'm not the only nut that logs every tank on a spreadsheet! I haven't graphed mine yet, but I would say it looks much like lego's graph but shifted down about 2 mpg and toss out the high mileage mark. I've got almost 14,000 miles logged to date, but I missed a couple of tanks at about 9000 miles.
#360
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Originally Posted by legokcen
It was a Panoz event at Road Atlanta. 3rd and 4th gear all day. Seldom under 5K on the tach. Redline every time I went from 3rd for 4th. Hell of a day. Worth every $ spent on gas.
#362
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I get about 21 mpg using 93 octane fuel. This is mainly hwy miles though. Around town I average 18mpg. Most I have got is 300 miles to a tank. I hear so many people say they get very low MPG. not sure why so low. When I drive hard I still get 200mile + from a tank
#363
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Ah, why not? Here's mine. The tall blip close to the start was from a 1500 mile trip. The rest is local driving, nothing over 50 mile one-way, nothing really heavily stop'n'go either though. 18.4 overall avg.
Last edited by Racer X-8; 01-08-2005 at 08:01 PM.
#364
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LOL, I just got my 8 but I already have my first fill up logged and I'll have a graph ready soon enough...LOL
Remember, I"m still breaking in my car and I shift between 3.25-4K and keep it under 5K, again...because I'm breaking it in.
With Citgo 93 (I got 252.5 in city driving @ 12.78 gallons = 19.75mpg) I was SO happy with my first tank, but I'm keeping it in perspective. I know once it's broken in I'll push her to 9K probably once or twice per tank, more if possible. What will that do to my numbers...I don't know, but I hope I got a good RX8 and I'm an efficient driver (YUCK, that just sounds wrong) so I'll be able to get 18mpg out of my 8.
Currently my needle is about 1/4 of an inch above half and I have 106.6 miles on my trip. Considering MOST people say they got better mileage with miles on the car, I think things are looking good right now. I can't stress "right now" too much here...
We will see...
PS. At least I can now say (some people here told me I probably would not get the EPA numbers) that for one tank...I GOT IT!!!
Remember, I"m still breaking in my car and I shift between 3.25-4K and keep it under 5K, again...because I'm breaking it in.
With Citgo 93 (I got 252.5 in city driving @ 12.78 gallons = 19.75mpg) I was SO happy with my first tank, but I'm keeping it in perspective. I know once it's broken in I'll push her to 9K probably once or twice per tank, more if possible. What will that do to my numbers...I don't know, but I hope I got a good RX8 and I'm an efficient driver (YUCK, that just sounds wrong) so I'll be able to get 18mpg out of my 8.
Currently my needle is about 1/4 of an inch above half and I have 106.6 miles on my trip. Considering MOST people say they got better mileage with miles on the car, I think things are looking good right now. I can't stress "right now" too much here...
We will see...
PS. At least I can now say (some people here told me I probably would not get the EPA numbers) that for one tank...I GOT IT!!!
#367
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Originally Posted by Oranje
The attached should make you feel less nutty.
Enjoy,
Oranje
Enjoy,
Oranje
I think your numbers confirm somethign I have noticed.
The 8 gets worse gas mileage in cold weather.
I have found that to be the case and may have found a way to fix it.
My car flooded for the very first time during a cold spell here in AL.
Right before the episode, it was getting really rotten mileage.
Of course it took quite a bit of coaxing to get it started again...so to avoid a possible repeat, I started revving the engine to 3k RPM before turning engine off every time.
Since then, I have seen my mileage go up very significantly.
I still continue to take this step before stopping the engine and I am getting consistent 20 mpg or better.
Since the car richens the gas mixture when running rough, and it runs somewhat rough when rich or flooded, I think the ECU is getting into a sticky condition which it is not programmed to get out of.
Any thoughts folks?
#368
Most of the miles are commuter ... about 70 miles RT on the days I take the eight out (only fair weather days) ... approx 65% of which are highway. The eight has been slumbering in the garage since just before Christmas.
I'd say I'm a mildly conservative driver.
Yeah I noticed the cold weather effect on the mileage, and chalked it up to Shell using a different cold weather blend.
[knock on wood] I've never experienced any hardstarts or a flooding experience, although I'm completely paranoid about it, even after a year, and never come close to shuting it off without it begin toasty warm.
Oranje
I'd say I'm a mildly conservative driver.
Yeah I noticed the cold weather effect on the mileage, and chalked it up to Shell using a different cold weather blend.
[knock on wood] I've never experienced any hardstarts or a flooding experience, although I'm completely paranoid about it, even after a year, and never come close to shuting it off without it begin toasty warm.
Oranje
Last edited by Oranje; 01-08-2005 at 09:13 PM.
#369
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Hey, that sounds like my daily commute RT milelage, which is about 75/25 Highway/Local mix mode. I'm getting about 19-22 MPG since the M flash. I think that's not too shabby, but definitely not the best it can do.
Just a FYI, did you guys know that some of the G35 Coupe owners get about the same, it not worse mileage that some of us.
Just a FYI, did you guys know that some of the G35 Coupe owners get about the same, it not worse mileage that some of us.
#371
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There is a PCM recalibration flash that you can request for free at a dealership (at least on a 2004 model). This flash supposedly makes flooding less likely and / or easier to overcome, and also supposedly slightly raises your MPG. I just got the flash, so I'm keeping track of how things are going. Previously, my MPG average was 18.8, and my average so far since the flash is 19.2, so it appears to have helped slightly.
I drive about 50/50 highway / city.
Just thought I'd share. I won't post my whole spreadsheet.
I drive about 50/50 highway / city.
Just thought I'd share. I won't post my whole spreadsheet.
#372
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yeah....ok...I don't do math nor am I capable of understanding spreadsheet software. But I know this...the last good driving day of recent history, I started the day with the needle on empty...outta gas...I cruised up to the pumps, fished in the old bottomless wallet and reclaimed $12. Our **** gas was going for $2.16-gal. I drove out my favorite set of twisties and straightaways, hit a personal high top speed for this car and came home. Round trip....36 miles. Gas is empty. It doesnt take a graph or spreadsheet to know that sux. Ah well....worth it.
#374
This is my rant..
I hope the first two months of owning my RX-8 are not a precursor of what's to come. The first problem was a cel that was apparently due to a engine coolant temp. sensor...easy fix, no big deal. Next was a dying battery. On cold mornings it would crank very very slow. You would think the dealership would have replaced it knowing it had been sitting on the lot for over a year.
Now it is my radio. I got in yesterday morning to go visit family and the speakers started making a sharp crackling noise. The stereo will come on but no music, no cd...nothing.
I know I will get flamed for this b/c it is a sports car and I am getting better mileage than a lot of people on here but the gas mileage sucks. I burned a half of a tank entirely on the interstate and got 18 mpg. The sticker says 24 on the highway. That is a 17% discrepency on a car that is brand new with less than 3,000 miles on it.
I got better gas mileage and had more power in my TII.....sorry for the rant but I think Mazda needs to keep a closer eye on quality control and put a little more into R&D. They have a great engine to work with but they are setting themselves up by pushing a car into the market before it is ready.
Again, sorry for the rant. I am sure I will be better tomorrow when it is fixed.
Now it is my radio. I got in yesterday morning to go visit family and the speakers started making a sharp crackling noise. The stereo will come on but no music, no cd...nothing.
I know I will get flamed for this b/c it is a sports car and I am getting better mileage than a lot of people on here but the gas mileage sucks. I burned a half of a tank entirely on the interstate and got 18 mpg. The sticker says 24 on the highway. That is a 17% discrepency on a car that is brand new with less than 3,000 miles on it.
I got better gas mileage and had more power in my TII.....sorry for the rant but I think Mazda needs to keep a closer eye on quality control and put a little more into R&D. They have a great engine to work with but they are setting themselves up by pushing a car into the market before it is ready.
Again, sorry for the rant. I am sure I will be better tomorrow when it is fixed.
#375
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One thing is for sure, there are some 8's with horrid fuel economy, or bad/abusive drivers. Don't get me wrong...I think it's a little bit of both, but I hope one day you guys/gals with bad fuel economy get a fix.
Right now I'm very happy with my fuel economy, but who knows if that will last. Time will tell...
Right now I'm very happy with my fuel economy, but who knows if that will last. Time will tell...