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i managea a 200 mile trip in my dads 08 silverado crew cab lt 4x4 z71, with the 5.3(327) 4 speed auto w/ 20's. i watch the gauge on the dash, and u can hear the cyc deactivation in his duel flowmasters, it sounds kinda funny. i got just shy of 25, i think it was 24.8, never went over 65mph.
but he gets 15-16 out of it normally.
still great for a full size.
i also hook up the sg to my friends 01 or is it 02 silverado reg cab 4.8 4x4 5 speed, and found it did 30 mpg at 40mph.......and 5th was useable down to abotu 15-20 mph. u could accelorate right out of it no studder. but a tiny bit of peddle it was 15mpg. haha just goofing off alittle i got low 20's mpg.
(k&n intake, eldbrock header, true duel exhaust w/ thrush and a diablo tune. not exactly stock and required premium)
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