Wow.. how much were you hauling to only get 12.7mpg? I always thought that newer vortec would get closer to 16mpg even at 75mph?
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We haul a LOT of gear, but that pic was taken on I-81 in Virginia which is a roller coaster; I don't think there's a single stretch of flat road on it, so I was probably going slightly uphill.Wow.. how much were you hauling to only get 12.7mpg? I always thought that newer vortec would get closer to 16mpg even at 75mph?
As Austin Powers famously said: I also like to live dangerously. On this last tank of gas I stretched it home from the lake and the ScanGauge says I used 23.2 gallons from that tank (out of 24) and drove 289 miles. It gave me a combined MPG of 12.4, which included a little bit of city driving (maybe 10% of that tank), about 120 miles of I-95 (though lots of stop-and-go as is typical of 95 in NoVa), and the rest on two-lane back roads in central VA. Said I averaged 34MPH on that tank as well.You probably have done this already, but check your ScanGaugeII set up... it will give you wrong info if not set up properly....
Unless you have cruise control it's hard to gauge with total accuracy the MPG.
With that said my MPG on the last trip was between 14-16 mpg...but I concur on a hilly hwy it's anybody's guesstimate what mpg would be...

Ok I must have had a misconception somewhere that most averaged about 16-18mpg with the newer LS setups. While I completely understand that most don't swap for the extra gas mileage, more for the power and useability of the engine, I just was surprised to see what I would consider low for a swap. Again my misconception, but that was part of why I was asking how much you were loaded. My truck is a daily driver and on a NORMAL week (whats that?!) I do about 60% of the tank city and then 40% on the highway (70ish mile round trip once a week for softball night). My average with my 2f keeping it about 65 on the highway and then normal city driving is currently at 9.8mpg. So even your 12.7 would be a 3mpg upgrade for me, not to mention the power/torque/etc. And I am still running the stock h42 so if I upgraded to an auto (BLASPHEMY!) or whatever 5spd I might eeeek out a little more.
