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Cumulative Gas Mileage (Gas MPG) Thread

Old 11-29-2004, 11:49 AM
  #51  
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Originally Posted by amartin
I drove 170 miles @ ~80mph w/no AC, ambient temp was ~65 degrees outside.

Result: 18.9mph... thats 100% Highway w/no AC.

... I knew my car wouldn't break 20mph, I just knew it.

I am really wondering how some people are getting 18-20 in the city... you guys MUST be shifting at 3000rpms or something...

Or there's a lot of lemon RX-8's out there.
yup, shifting unders 3000 rpms helps. At 2500 rpms you are using one injector. With mixed Highway and city driving I get at least 300 miles to the fulltank
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Old 11-29-2004, 12:44 PM
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amartin, try it again at @65 mph BUT do the 20 pump test to reset your ECU BEFORE the test. I believe your ECU will then start at a conservative level and get you over 22 MPG. Also, keep the shifts before you go onto hwy cruise at no higher than 3000 to 3500 rpm. When you get onto the fwy, set cruise control @65 mph and keep it set as much as you can.
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Old 11-29-2004, 12:48 PM
  #53  
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shifting at 2500? you might as well get out and push, since shifting at such a low RPM is both painful and slow. I'd rather sacrifice a gallon of gas per mile so I could have my car driven the way it was intended.

God i love these mileage threads.
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Old 11-29-2004, 12:58 PM
  #54  
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300 miles at 73 mph, a/c about half the time (rainy, had to defrost) - 22.5 mpg.
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Old 11-29-2004, 01:04 PM
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beatin' a dead horse again!!!!!!!!!!!
u can't afford the gas--u can't afford the car!!!!!!
Shift at 9100 and move on with your life................
G.
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Old 11-29-2004, 01:15 PM
  #56  
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Nice quote r8ped
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Old 11-29-2004, 03:17 PM
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Actually, I did this calculation:

Right now, at ~8500 miles on my car (and assuming gas is $2/gallon)

At my usualy 13.5mpg, thats 629 gallons or ~1260 bucks.

If I was getting the EPA 18City I would have used 472 gallons and had spent $944 dollars... and had saved $316 dollars to date.

Sure..300 bucks isn't much... and actually, its not the $ its the fact I have to freaking stop and get gas so often.
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Old 11-29-2004, 03:57 PM
  #58  
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8500 miles over how long?

less than 50 bucks a month?

yadda.
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Old 11-29-2004, 04:30 PM
  #59  
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be thankful

Be thankful for the mileage you're seeing, I wish I got close to that, but I'm not going to complain about it.

It's a sports car, if there weren't any sacrifices associated with owning a sports car EVERYONE would have one.
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Old 11-29-2004, 04:32 PM
  #60  
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I drive around the city of Atlanta and to Augusta every 3 weeks. My average MPG is between 19.6 and 21.5. I pretty much drive however I feel like driving. I must admit, and please don't flog me for this... I bought a Turbonator for about 20$ on Ebay, and I have consistently been getting about 1.5mpg more.

I measure everytime I fill up by logging the miles and the gas put in the tank to get my numbers. I logged in about 4500miles before and about 4300miles after.

I am not saying it is worth buying, but It did make a tiny difference.... Oh yeah, I am operating on the M flash.
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Old 11-29-2004, 04:44 PM
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Originally Posted by Charles R. Hill
With the "L" flash I was getting 23-24 mpg but the car only ran okay in the midrange rpm's. It didnt't really wake up until 6K. However, with the "M" flash it now gets 19-20 mpg but will easily tear the rear tires up if I am not careful. Of course, I have other mods but I think the new flash will benefit most everyone. I measured a 20 hp increase at the wheels with the M.

Charles
You measured a 20HP increase at the wheels?

Are you sure about that?
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Old 11-29-2004, 04:59 PM
  #62  
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Here we go again. I'm just trying to help amartin determine if his car is defective or not. That's it. If he follows my suggestion and gets at least 22 MPG, then his car is probably not defective.
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Old 11-29-2004, 05:04 PM
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Charles said he got 20 HP increase measured by GTech, I believe.
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Old 11-29-2004, 05:08 PM
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you guys and your econoboxes....
my bridge gets like 13-14!
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Old 11-29-2004, 05:09 PM
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Originally Posted by w2aew
Do yourself a favor and CALCULATE the mileage based on miles travelled and fuel consumed. A "tankful" is not a precise measure of fuel used, because some people fill up at the 1/4 mark, some at the 1.8 mark, etc. The ONLY way to compare your mileage with others is to do the math.

The tank holds about 15 gallons, but you don't run it down completely. Lets say that there's 3 gallons left when you fill up, this means that your getting 18.3 to 20.0 miles per gallon, which sounds just about right.
Yeah, listen to what w2aew is saying. You've got to calculate mileage CORRECTLY. You can't just go by range. Remember, you have to use the amount of gas used to FILL UP ALL THE WAY at the NEXT gas fill up. In addition, the tank that you just used up HAD TO HAVE BEEN FILLED ALL THE WAY during the PREVIOUS gas fill up. Otherwise, you can't correctly calculate.

Please report what you're getting. I'd like to know.
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Old 11-29-2004, 05:21 PM
  #66  
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Originally Posted by r8ped8
beatin' a dead horse again!!!!!!!!!!!
u can't afford the gas--u can't afford the car!!!!!!
Shift at 9100 and move on with your life................
G.
Too bad you packed the car away for the winter because those corners sure are fun when you take the DSC/TC off and start hitting around 8k rpms... :D

And for those of us who live in Washington state keep in mind that we have oxygenated gasoline and will see worse gas mileage because of it. So don't expect to break the 20 mpg mark with Washington gas. I went through the same thing last year.
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Old 11-29-2004, 06:31 PM
  #67  
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From the point that the pump stops from the tank being full to 10 miles after the light comes on is what I consider a tank. (13.5 - 14.0 gallons).
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Old 11-29-2004, 08:40 PM
  #68  
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I set the cruz between 60-70mph in the slow lane and have got 27.5 twice and now with over 15k I got 29.3mpg. It's pretty booring but it can be done if you have patients. This is my 7th rotary and its to much fun to rev to do it more then once or twice a month.
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Old 11-29-2004, 08:58 PM
  #69  
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Originally Posted by amartin
Sure..300 bucks isn't much... and actually, its not the $ its the fact I have to freaking stop and get gas so often.

I'm with you....the mpg aren't as big a hassle as the fill ups per week. Too many empty tanks around 200 miles which means too many trips to the gas station. A bigger tank would be nice.

~ Matt
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Old 11-29-2004, 09:27 PM
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Originally Posted by r8ped8
beatin' a dead horse again!!!!!!!!!!!
u can't afford the gas--u can't afford the car!!!!!!
Shift at 9100 and move on with your life................
G.
I totally disagree! Although I spend much time at the higher RPM levels, and expect my MPG to suffer, there's other people that post they can drive it like they stole and still get good MPG. I do not have one of the several cars that get 13-15 mpg, but I also (like the thread starter) have a car that can not reasonably get over 20 mpg. I do not cruise at 60 or 65, rather I cruise at 80-85, and can not break into the 20s. It's not so much that I can't afford the low MPG, I can, it's the question about should it be so low. I think not! My mpg difference between granny driving (I must admit, I've only accomplished this once or twice) and fun-style driving results in a 2 mpg difference, and this is consistent with other people here. Driving style has little effect compared to different cars. I don't know if that made too much sense, so restated, it appears some people get great MPG no matter what, some people get lousy MPG no matter what, and some people (like me) get middling MPG no matter what. Each car is consistant but there's no constistency amoung different cars. So the real point is do you want to drive it like you stole it and get good mpg, or drive it like you stole it and get lousy mpg. Of course it's rhetorical.
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Old 11-29-2004, 09:40 PM
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Originally Posted by red_rx8_red_int
I totally disagree! Although I spend much time at the higher RPM levels, and expect my MPG to suffer, there's other people that post they can drive it like they stole and still get good MPG. I do not have one of the several cars that get 13-15 mpg, but I also (like the thread starter) have a car that can not reasonably get over 20 mpg. I do not cruise at 60 or 65, rather I cruise at 80-85, and can not break into the 20s. It's not so much that I can't afford the low MPG, I can, it's the question about should it be so low. I think not! My mpg difference between granny driving (I must admit, I've only accomplished this once or twice) and fun-style driving results in a 2 mpg difference, and this is consistent with other people here. Driving style has little effect compared to different cars. I don't know if that made too much sense, so restated, it appears some people get great MPG no matter what, some people get lousy MPG no matter what, and some people (like me) get middling MPG no matter what. Each car is consistant but there's no constistency amoung different cars. So the real point is do you want to drive it like you stole it and get good mpg, or drive it like you stole it and get lousy mpg. Of course it's rhetorical.
That's deep--thanks for the insight
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Old 11-30-2004, 12:16 AM
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Originally Posted by r8ped8
That's deep--thanks for the insight
Do one of those faces to yourself.
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Old 11-30-2004, 12:37 AM
  #73  
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Originally Posted by r8ped8
beatin' a dead horse again!!!!!!!!!!!
u can't afford the gas--u can't afford the car!!!!!!
Shift at 9100 and move on with your life................
G.
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Old 11-30-2004, 03:59 AM
  #74  
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I get like 210 miles per: (gas pump fill to gas light on for 5 miles). The area I live is hilly with much stop and go, and I usually shift at about 4500 (6 spd), trying to keep it at about 4 k when I'm not passing anyone.
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Old 11-30-2004, 05:57 AM
  #75  
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You know I was going to throw my two cents into this topic...LOL :D

I wont say much but I wonder what a Mazda engineer, CEO, etc would pay attention to with their next update of the RX8 if they visited this site.

MORE TORQUE
BETTER FUEL ECONOMY (or at least a 17 gallon tank)
MORE HP

Now go...go Mazda...and build a EVEN BETTER RX8....

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