I get about 25-28 pretty consistently. About 80% hwy 20% city. Only engine mod is a FWI.

I hear ya.

 

I get between 16-17 around town with a heavy foot. Intake/exhaust/tune with heavier wheels and tires.

 

how do you calculate this? lol

 

Using the thing that says what milage I am getting thats on the roof by the mirror (not sure what its called lol) but I look at it a lot when I am driving.

 

And by knowing which way the wind is blowing lol

 

i take it you're on a long straight road then? lol that's where my questioning was from kinda hah

 

idk how many of yall have the overhead thing that tells your mpg. but, that thing is my best friend. i havnt checked it lately, but when using the instant reading, i can get around 25-30 mpg. i think my current average for city is 22-25.

i once drove 200 miles on 1/4 tank.

 

the first 1/4 i take it lol, the SS cluster is great the first 1/4 of a tank and then your gas just goes away haha

 

I've hit 26 a couple times on highway and it'd say around 22 city (if i baby it) I'm going on a completely stock LS4. --Some sort of intake is coming (if not for economy, for engine sound), i just have to wait until warranty work is done. I'll probably end up making my own FWI with a K&N filter. . . think this will change MPG'S much?

 

I measured my mileage one time with 100% city driving doing burnouts, gunning it from stops, and beating the crap out of my Monte and when I filled up I had gotten just over 17mpg. On highway driving only, I've seen as good as 27mpg.

I've also found that with my Aeroforce Scangauge, that when I let off at 90mph, my Monte returns 193mpg