I average about 17 city, 22 highway. With probably 35 city / 65 h-way I get about 325-350 miles out of a tank, although that's dropping substantially since they start adding **** to the gas so it doesn't freeze in the lines with the winter temps.

 

Right now I'm getting around 22-25 mpg (05 Supercharged SS) with about 70% in town driving 30% highway driving, lately she has just been sitting in storage, I dont do much in the colder weather so she dosent see much road time. My trucks getting 12 mpg highway lol.

 

I calculate mine at each fill up, write down the mileage each time. Subtract the difference between fill ups, divide the distance driven by the gallons needed to re fil. I'm surprised at the 3800's they're getting pretty decent mpg's

 

yeah i know that, just didn't know how he did it calculating with the wind and stuff.

 

I'm interested to see what other people with the Supercharged model get with more highway driving cause I'm sure mine owuld be higher if I kept out of the pedal and drove more highway miles lol.

 

The most I got on highway road trip was 28-29 ,With Both 3800 Supercharged 2005 Monte carlo SS , and 2005 Impala SS Supercharged

 

I avg 28-34 depending on if my cel is on or not lol gto 26-28 hwy woo lol

 

Wow, i'm really impresed by these numbers. Especially the fact that L67 powered cars are getting better fuel economy than my 3100

 

Well I always thought the supercharged would at least get 31 but hey those numbers are nothing to complain about when my trucks getting 12 lol

 

In the city I usually get about 19 or so but have hit 30 on a few long road trips. My car is a stock L67.