BrilliantBlack8

Im at a half tank right now and i have 56 miles.. how shitty that? my last tank was 11.7 miles to the gallon..this car will not be around much longer.
robert

Go48

Now that's REAL data Lego. I track my mileage closely also, and although I only have 2,500 miles on the car, the average is just under 20 MPG. I classify myself as the average RX-8 driver. That is, run the revs up to near red line a few times on every drive, and on some sporty drives in the twistys, run it up there frequently.

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.

MI_FamilyMan

Like some have already mentioned, the fuel gauge moves a lot quicker over the first half of your tank. You definitely have to measure over the course of an entire tank to get a realistic number, and calculate based on the number of gallons you fill with.

But I guess they don't let you drive much when you are in jail??? :p

MI_FamilyMan

7.2mpg at a track day??? Ouch...

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.

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.

Paul_in_DC

Ha! And I thought -I- was the only one obsessed enough to make a graphic of my mileage! :D

poolsidenaz

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.

Nick

That looks pretty near identical to what I've got... probably an average of 18.0-18.5, with lows near or just past 16.0 (at the end of the tank). I've experience what everyone else has experience with the half-way point. I noticed also that the 3/4 and 1/4 marks aren't even really 3/4 and 1/4 on the dial.. more like 13/16 and 3/16 (there is a wider space between full and "3/4" than between "3/4" and "half" - quotes used because I think we all realize by now they mean nothing )

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.

DemonRX-8

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.

MI_FamilyMan

I bet. I believe I've seen the video posted on another thread. Looked like a ton of fun. Hope your car is holding up ok. Never been on track with mine, but I dream about it rather frequently...

Mikelikes2drive

@ my halfway i get about.... 90 miles with about 40% highway driving

Limey

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

Racer X-8

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.

rx8wannahave

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!!!

Oranje

The attached should make you feel less nutty.

Enjoy,
Oranje

rx8wannahave

Oranje...nice numbers!

How would you say you drive your 8...conservatively, agressive, or something in the middle?

speedweasel

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?

Oranje

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

rx8loc

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.

NgoRX8

iTrader: (1)

my mileage hasn't been a good one, i drive all city and average about 13-14 miles per gallon. my last tank was 174 miles till my light turned on, which showed to be 13.4 mpg. i live up a hill but i doubt that would kill my mileage this bad.

Katie

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.

Batmobile1

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.

mikeb

I'm just glad gas prices went down here in cali
I get about 15 mpg

rgordon1979

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.

rx8wannahave

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...