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Cumulative Gas Mileage (Gas MPG) Thread

Old 11-17-2004, 10:47 AM
  #26  
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Originally Posted by czr
My use of cell phone at the gas station
I hope it wasn't while you were pumping gas?
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Old 11-17-2004, 10:47 AM
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Originally Posted by Dephender1
Jason,

I'm not sure I understand what you meant by your low fuel indicator light coming on at 13 gallons. According to the Owners manual, the capacity of the fuel tank is 15.9 gallons as SantozRx8 has stated. I am basing my calculations on the 15.9 gallon value. For future reference, when the low fuel indicator light comes on, that translates to approximately two gallons of fuel left in the tank. This is just a preventative setpoint in most automobiles to keep drivers from being stranded. But with the RX-8, when that light comes on, its like a race to the gas station! Aside from the speedometer and the tachometer, the Fuel gauge is very dynamic!! I watch that gage go down as the gas price goes up!!! yikes!! Thanks for the concerns and comments! And Santoz, thanks for the clarification! I'm sure we're all happy RX-8 owners, but that 12.5 mpg really does suck doesn't it?
... but what does the pump indicate for amount of gas pumped in? That's the only number that's important. Unless you drive for a long time with the low fuel light on you're probably putting in just 13-13.5 gallons as Jason mentioned... so your mileage is in the 16's, which is normal. I've yet to put in more than 14.5 gallons, and in that instance I drove 35 miles with the light on trying to find a gas station.
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Old 11-17-2004, 10:48 AM
  #28  
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Originally Posted by nojooc
I hope it wasn't while you were pumping gas?
You don't believe that myth, do you?
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Old 11-17-2004, 10:52 AM
  #29  
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Originally Posted by nojooc
I hope it wasn't while you were pumping gas?

How would you calculate the gas if you don't know how much gas you pumped in? So, of course it wasn't used while gas was still being pumped.

Also, using the calculator function would just be using the calculator at a gas station.

Also, no gas station has ever been proven to blow up by use of a cell phone. I don't know about other countries, but some states don't even have that law.
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Old 11-17-2004, 10:53 AM
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Originally Posted by G8rboy
You don't believe that myth, do you?
Not really.... I chat via bluetooth headset while filling up sometimes. :D
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Old 11-17-2004, 11:39 AM
  #31  
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Originally Posted by czr
You can not accurately guage mpg by only assuming how many gallons of gas filled up. Jason, even just 13 is not accurate.
No kidding.

This guy doesn't even get the basics on how to calculate mileage, what I mentioned is accurate - you just have to use real numbers, not an example number. There is no reason to complicate things when trying to explain basics to someone.
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Old 11-26-2004, 10:18 AM
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Oxygenated Gasoline in the Northeast = Bad Mileage

Since they've made the seasonal switch to oxygenated gasoline, my mileage has utterly plummeted. Whereas my RX-8 previously averaged 20-25 stop-go/highway, I now see about 200 miles for the tankful. I've tried alternate brands including V-Power, but the seasonal oxygenated grade is the only thing available.

Has anyone else had a similar experience? My RX-8 has about 10,000 miles.

I can live with the seasonal lower MPG, but the reduced range is going to get me in trouble.
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Old 11-26-2004, 05:37 PM
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That could explain why my mileage went from 13mpg to 10.
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Old 11-26-2004, 05:39 PM
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By the way just what does oxygenated gasoline mean. How do they do that. maybe I could undo it.LOL
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Old 11-26-2004, 06:00 PM
  #35  
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Oxycrap.....

The oil companies are forced to add alcohol to the gas, by state law.
In the corn belt, the farmers lobby mandates that ethanol from corn be added, but elsewhere it is usually MTBE (methyl tertiary butyl ether).

'Good' for the environment, but bad for your wallet and mileage. They can only put about 10% in, (it separates out if you put more) so your range shouldn't be reduced TOO drastically, sounds like it is more than just seasonal gas that is affecting your '8.....
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doc
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Old 11-26-2004, 06:31 PM
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My mpg dropped from 17-19 to 15-16 (mostly city) over the last month or two. I think another contribution factor is extended warmup times. Are you idling too long when you're warming up the car?
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Old 11-27-2004, 04:21 PM
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I just got my RX-8, can you guys help?

Hey everybody!
I'm really startled in how much gas my RX-8 is wasting. It's brand new, got it off the dealer with 11 mi. It seems as if I'm getting around 220 to 240 mi. per tank. I have the auto version. Is that right?
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Old 11-27-2004, 04:55 PM
  #38  
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“Wasting” in not really the correct term. Rotaries do not use fuel the same way piston motors do. Assuming you are putting in about 13 gallons at a fillup you’re getting over 18 MPG, which is not bad for this car. I get around 19-20 it’s just something you have to live with and has been covered to death on this board. If you have a few days to kill use the search feature for terms like “ MPG”, “Gas mileage”
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Old 11-27-2004, 04:57 PM
  #39  
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I get 240 pretty consistently now - 6spd here.
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Old 11-27-2004, 06:37 PM
  #40  
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Originally Posted by mclarenracer22
Hey everybody!
I'm really startled in how much gas my RX-8 is wasting. It's brand new, got it off the dealer with 11 mi. It seems as if I'm getting around 220 to 240 mi. per tank. I have the auto version. Is that right?

I got 220-240 on my first 2 tanks. Then I got the "M" flash and I can't do better than 180.
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Old 11-27-2004, 06:41 PM
  #41  
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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.

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Old 11-27-2004, 10:45 PM
  #42  
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I have an automatic. I consistantly get between 220 and 240 myself.
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Old 11-28-2004, 12:25 AM
  #43  
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RX-8 has a small fuel tank - that's what you're noticing.
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Old 11-28-2004, 01:26 AM
  #44  
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i get about 180-190 if im lucky i get 200 -____-
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Old 11-28-2004, 10:24 PM
  #45  
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Originally Posted by mclarenracer22
Hey everybody!
I'm really startled in how much gas my RX-8 is wasting. It's brand new, got it off the dealer with 11 mi. It seems as if I'm getting around 220 to 240 mi. per tank. I have the auto version. Is that right?
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.
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Old 11-29-2004, 12:25 PM
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Gotta love it.. another gas milage thread... did a test..

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.
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Old 11-29-2004, 12:32 PM
  #47  
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Actually, I do shift at 3K RPM in the city when I'm just putting around town. I've done this in all my cars, and it always gets me the best MPG.
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Old 11-29-2004, 12:36 PM
  #48  
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i usually shift from 3k-4k just doing city driving and get about 17 mpg, but at higher speeds you'll get worse gas mileage...if you do your test again in the mid to high 60 mph range it should be better
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Old 11-29-2004, 12:36 PM
  #49  
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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.
I'd bet if you drove at 60mph, you'd get well over 20mpg. Your car can get better than 20mpg, IF the driver decides he/she wants to.
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Old 11-29-2004, 12:37 PM
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Am cruising in 6th gear at 45mph or above. In 5th at 35mph, but I drive my car hard. Shift at 6000-7000rpm most of time unless just feeling gentle, then maybe at 4000rpm.
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