2quick98

Hey guys I just went down 1 Pully size and added meth I got it retuned and the tuner said all he done was added 2 degrees of timing I was getting around 28 now it's 21-23 will upping boost kill gas Milage I have a 98 A&A running 11 lbs boost Thanks

Forcedvert

I have no idea, I'd be happy with 21-23. I can't keep my foot out of it enough to get anywhere near that average.

Are you talking average or instant?

2quick98

Average on interstate running around 70 . Yea I hardly ever get more than 15-18 arond town just don't understand I know with more power comes less gas but when I went from stock 328 rwhp to 515 rwhp I drop from 30 hwy to 28. And now I gained right at 50 with the smaller pulley and meth and it killed my Milage so just wandered what u guys thought

Ls2gtoowner

My gas mileage is terrible around town I get 13ish having a tad bit of fun but mostly cruising and on the highway it jumps to like 23-25 depending on my cruising speed. I am running 14 psi with a big cam meth and so on. Made 711rwhp.

I didn't buy the car for gas mileage though. I have a civic that gets 35mpg that I drive daily.

PEETYZ

21-23 isn't terrible.

How did you calculate the mileage? You can't really go off the computer once you change injectors. I get 21 mpg on the highway but I do have the ZR1 5-6 gears so its at like 2,300rpm on highway at 70 in 6. I just checked the old fashioned way filled up tank completely, reset trip A, then had a 1 hour drive and filled back up and divided the miles traveled by the gallons it used.

juice12

Hell I get 18 on interstate with e85, most tanks are 14, with 840 whp, runs 2000@80

Quickshift_C5

With a built motor (still 5.7L), blower cam, full exhaust and 12# of boost, I get 26mpg highway and 18mpg in town. 638rwhp