Thread: question on mileage

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Originally Posted by 34_40

And this is why all the new cars are all automatic / computer controlled with 6 to 10 speed trannies.

I drive a lot (50K+ a Year), and I like GMC pickups (specifically, white Z71 SLT Crew Cab ones)-

So, I go through one about every 3-4 Years or so (it ain't cheap)-they are all equipped with 5.3's. 3.42 rear axle, posi, Tow pkg., etc.)-

Anyway, the reason I am telling you this is that I have always got around 21-22 mpg (on the highway) with this combination (I live in the western US, and drive the in the Mountains almost exclusively)-

So, when I got my first 2011 pickup, it took me awhile to get used to the 6 speed Transmission-after break-in, the first thing I noticed was that my Gas mileage dropped down to about 15-16 mpg (highway)-I surmise that our western rolling hills and mountains are making the Trans shift a lot more, and it will stay in, say 5th going up a hill (so it uses more Gas-when it is hilly it seems to be constantly shifting)-

The upside? These newer Trucks (with the same Equipment) will absolutely stomp my old body style, 4 speed truck-bad-(I've talked my way out of 2 Speeding Tickets in just the past Year-remember, always be nice to the Officer!)-