Okay, we've had our 3.73 07 LTZ since June 16th. I thought I'd post some info that folks may find useful, especially prospective owners.

First, here is the general profile of how we use "Foxy" (my wife's pet name for it ): we live in the Atlanta area. She drives 70 miles roundtrip to work every other week (she's in a carpool). It's all highway, but in Atlanta, it's usually stop-and-go for a bunch of it. We own two businesses on the side. We don't tow. There have been two road-trips from Atlanta: St. Louis & Raleigh.

Here are some numbers:

Total Miles Driven: 6,245
Total Fuel Used - based on DIC: 422.9 gallons
Total Fuel Used - Amount purchased: 422.4 gallons (looks like the DIC is pretty accurate)
Average Miles per day: 84.5 (June = 74 / July = 61 / Aug = 109 (road trips!))
Total MPG: 15.2 (Jun = 13.8 / July = 15 / Aug = 15.6)
Gas Cost: $1,187 (87 octane, no ethanol)[/align]

 

Great accumulation of data - 2WD or 4WD?

 

Sorry. Left that out. 2WD.

 

Are you running stock size tires? What does the DIC say the avg MPG is or is that what you're going by? If you calculate out the fuel / milage ratio you list it works out to 14.78ish. No worries on the fraction of a gallon, just trying to figure out the accuracy of the DIC. If I was worried about milage I would have bought a Honda! I'll post the sad news once I get my 33x12.5's mounted.

 

yours is doing a better than mine, I wish i was getting 15.2, im only 11.5 maybe even lower....but im also running 285/55r20's, but i dont think that it should effect it that much....maybe the lead foot

 

I didn't catch the discrepancy with MPG, but it should say 14.8 overall. Everything on the ride (including the 20-inch Dueller tires) is stock EXCEPT the K & N Performance intake & filter. Also, I changed to synthetic oil @ 1500 miles.