where did my milage go

[adam levy]

i have been driving my car a lot , when i first got it 22 mpg add the tt chip and i am at 14 mpg , whats up with that ? anyone have a good reason for this please let me know how to fix it ..

 

[1970gsx]

My guess is alot more driving getting into boost. :burnrubber:

 

[72firebird]

Yeah 1970GSX is probably right. At 22 mpg I'd guess that was almost all highway driving, I think the best I have gotten is around 25-26 mpg. In town though is a whole different story, I normally average around 12-15 mpg depending on how spirited the driving was on that tank.

 

[TTA984]

Same here around town, with some boost.

 

[echostatic]

14 city is about what I get, you wanna fix it, buy another car

 

[adam levy]

thanks , makes me feel better about it . and as far as getting another car , well that will not happen . thanks to all.....

 

[echostatic]

Oh of course not. I was joking, hence the smiley. You would be hard pressed to find an upgrade to the TTA in the same price range.

 

[72firebird]

thanks , makes me feel better about it . and as far as getting another car , well that will not happen . thanks to all.....

No problem, that's what we're here for. I normal engine only runs on vacuum so the amount of air the cylinder gets is determined by a lot of stuff (valve over lap, head design, intake, etc) but it's limited by the maximum volume of the cylinder (it never fully fills though). When you have a turbo or supercharged system though you can force the air in, so if you're running at 1 bar (~14.7 psi) you would theoretically have twice the amount of air in the cylinder and you're going to need more fuel to burn it. This same principle applies to nitrous.

 

[adam levy]

really cool thanks good info !!!

 

[fastgreek]

DEFINITELY BOOST ....................