The turbo 408 with 80e averages better than 14 MPG with my stupid driving style. It would probably get better fuel mileage with some tweaking of the tune. The 408 got about the same fuel mileage when it was in the 93 truck with nitrous, except at the track where you could watch the gas gauge drop after each pass down the track.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
15-16mpg in my truck @ 74mph, 12-13mpg in town. Tahoe 17-18mpg @ 75mph not bad for a vortec 350.
slowly getting somewhere, 12.75 @ 105 1.77 60', 414rwhp/417rwtq
My rcsb 4.8 is 12-14 in town and 20-22 highway...i need 3.08 gears bad...
With my 5.3 and BDD cam in an ecsb eith no stall and 3.73's with 31.5" tall tires I average 16-18ish. If I drive conservatively I have seen as high as 20 after the cam. Before the cam I had seen as high as 22 under good driving conditions.
T-RAV99 GMC | 5.3 | Skinny White Guy Tuned
since i moved closer to work and when i do drive the yukon i tend to beat on it lol im getting about 12-13mpg in town. weve seen low-mid 20s on the hwy on a trip a few times but that was mid 70s temps extra air in tires stayed at 70mph all planets aligned perfectly ect ect lmao
03 yukon xl:intake, longtubes ory,performabuilt lvl2,circle D 278,tune, tint, lt1 fans
92 z28: lb9 air foil vette servo magnaflow catback adjustable pan hard rod Lcas lcarbs
86 trans am: lm7 hot cam th350 3500 stall
about 6 in town and some where between 16-22 hwy depends on hills
Mods:
Maybe STOCK
"My lugnuts require more torque than your ricer is ever going to produce"
Sleep: That Stuff Is Overrated
"You don't care what it is, or who makes it, as long as they race it. You my friend are a true Gear Head!" (Drew Anderson)
Who's the real culprit of Obeisity: video games because their scared of physical activities, or Pillsbury for being so delicious?
im around 12-13 round town and 15 interstate running 75 mph. it does about 17 if i run 50-60. the 08 sierra gets about 20 with mixed driving
2008 GMC Sierra SLE....370ci LY6 with some goodies
1995 C2500- LS1 swap with a mp112
build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
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