I recently bought this 2010 ecsb 4wd with 5.3 and 3:08 gears. Wasn't my first choice as far as 3:08 gears but the deal was good. My driving every day consist of a 14 mile round trip to work with one red light and two 4 way stops. I drive normal and I have hand calculated it several times to always come up with 11. 2 to 12.4 mpg. Is these 3:08's the reason or is something wrong? I want to upgrade to 33's but then I'm gonna probably be in big block mpg range. My 98 5.7 averaged around 14. I did take a trip to the mountains and filled up before getting on the interstate and then when I got to my exit I filled back up. I run the piss out of it with constant downshifting to maintain speed even on the slightest hills and had a hand calculated average of 18.7. Is the gear swap gonna be my best bet for my daily commute?