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Old 04-12-2011, 10:48 AM   #15
SUX2BU
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Originally Posted by InvaderMoose View Post
....How.

No matter what I do, highway or city, whatever speed I go, I just cant get more than 13mpg
Just get on the highway, cruise at 65 mph or something and reset your average fuel economy counter. Voila!
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Old 04-12-2011, 10:55 AM   #16
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Yeah this aint to hard to do or believe. I get 27.4 stock and thats cruising right at 70. So yeah 65 and 55 is gonna really throw you up. Go 70 and then report back what you get.
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Old 04-12-2011, 11:06 AM   #17
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Originally Posted by Robert@G-Force View Post
Just a FYI if your car has larger than stock injectors the average fuel economy calculator is wrong.
Ok..

The next time I'm doing some longer highway driving I'll make sure to top off, drive a ways, read the mileage and top off again and do the numbers myself.
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Old 04-12-2011, 11:33 AM   #18
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In addition, if you go with bigger wheels/tires, and your actual diameter changes, then you have to add the percentage to the mpgs. So, if your total diameter goes up 10%, add 10% to your speed, milage, and fuel milage
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Old 04-12-2011, 11:35 AM   #19
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Originally Posted by Cbrenthus View Post
In addition, if you go with bigger wheels/tires, and your actual diameter changes, then you have to add the percentage to the mpgs. So, if your total diameter goes up 10%, add 10% to your speed, milage, and fuel milage
That I know. I'm on stock rubber/tire -- 20" Polished w/ PZ0s.

I'm not too terribly worried about my mileage being wrong if it's in fact wrong due to tune, injector size, etc... It's just a neat picture.. If it's not accurate, then so be it.. I don't drive it every day.
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Old 04-12-2011, 11:39 AM   #20
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Originally Posted by Cbrenthus View Post
In addition, if you go with bigger wheels/tires, and your actual diameter changes, then you have to add the percentage to the mpgs. So, if your total diameter goes up 10%, add 10% to your speed, milage, and fuel milage
Most people tune for that so the computer already accounts for it.
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Old 04-13-2011, 12:23 AM   #21
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very nice. i get 30mpg on my 02 Z28. so on a heavier car w/ supercharge thats excellent.
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Old 04-14-2011, 04:00 PM   #22
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I avg 25-28 hwy. dont exactly stay at speed limit, but usually ever 5 over
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Old 04-14-2011, 04:42 PM   #23
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Originally Posted by HumanWiki View Post
Ok..

The next time I'm doing some longer highway driving I'll make sure to top off, drive a ways, read the mileage and top off again and do the numbers myself.
This is the ONLY way to do it accurately, I bet that number your dash gave you will drop by about 20%
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Old 04-14-2011, 06:30 PM   #24
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I get 26-28 stock
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Old 04-15-2011, 07:28 AM   #25
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Nice. Best I got on a trip was 29.3
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