they say 4.10's will help with city driving and hurt with highway. At 70mph my readout shows 21-22mpg. I can get it up to 24 if I stay right at 60. Supercharging really doesn't hurt your gas mileage if you don't use the power, but who can resist showing people just how slow they really are whenever possible.

I'd say wider tires would hurt you gas mileage more than any supercharger.

 

[8D]Yeah, sure feels that way!

My readout says 12.5 city and 19.5 highway (easy driving). Advertised stock was something like 17/23? Gotta feed it a little more oats but WTH LOL

 

I get around 14 around town and 17.8 average. I have never checked highway only driving. I was averaging around 23 before supercharging, so it definatly hurt my milage.

 

Whipple HO at 10.5 psi and get 15-17 mpg city, and 19-24 highway. FRPP tune too

 

Whipple HO, FRPP tune, 10mpg city, unknown hwy.

 

Vortech SQ at 11psi
comp stage III cams
4.10s/spydershaft/spec clutch
plenty of other crap


I still average 19mpg in town & about 22 highway

 

you guys are getting better mileage than me?!?!? and i'm not even supercharged. lol i'm at 14.7 on my readout. maybe 5 minutes of highway though.

 

no kidding, sheesh without a supercharger i get 14mpg when im lucky, with my 02 saleen with a kenne bell i got between 7-10mpg 12 if i stayed out of it...must be my foot.

 

They don't need the lead foot to get higher speeds.

 

I got 21 or so with the 4.10's before after the turbo.

I have 3.55's now and get 26.4 mpg on the freeway @74ish.

Who cares about city?