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Gas Mileage after mods

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Old Sep 10, 2004 | 01:25 PM
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From: Friendswood
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Originally Posted by bletour2001
How are you measuring your MPG? I have noticed that after a tune my "computer" is no longer accurate. It claims I am getting 23MPG but doing the simple math of miles/gallons I see it is more like 18.5MPG. Before I got that car tuned the computer was damn close. SOOOooooo if your not actually calculating it yourself and relying on the computer you may be .

I don't understand how you guys get these crazy 28-29MPG numbers either. Must be in the midwest or somewhere with 0 hills. Here in New England I have done numerous attempts at maximum MPG on the highway and NEVER see more than 23MPG. That is REALLY babying it.

--Bill
I have 2000 Trans Am, so no computer to calculate. I'm doing manually, taking the total miles since last fill-up, dividing by how many gallons it took to fill-up. Last tank - 15.5 mpg. I thought I was babying it, too.

Question: does idling in traffic and driving up 10 floors of parking ramp seriously effect mileage? Maybe that is having an effect? What about weather conditions being more humid?
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