I have a 2011 Silverado 2wd crew cab. I think the door sticker says fully loaded it weighs 6500#. It has the 4.8 V8 with nothing fancy except roller cam, tach. redlines at 6k, had it to 4 on a couple of occasions and it seemed eager for more. Smoothest (4 sp.) tranny I ever had.
Somewhere along the line, GM realized (maybe watching Dodge...er ah Ram) that an engine is an air pump and as such you needed large tubes if you wanted to pass large amounts of air. So they opened the intake mechanisms, intake and exhaust ports on the engine proper, installed a low restrictive cat. converter in each bank's exhaust and a large exhaust system. Other than my 2009 Dodge Hemi, I never had a truck, especially one weighing what this one weighs, with this kind of performance.
Engine is E-85 Flex-fuel rated. I use 89 octane. Tried 93 once and didn't notice any difference other than price. My current mileage is 37k. My MPG are a constant 16.6 and most of the reason for the low number is putting around the farm. I have the resettable MPG doo-dad on the dash and if running up and down the road, it runs 20-21.
On being flex-fuel rated,I don't think I'm penalized.
On E-15 congress is currently looking at approving it for year round usage. I understand it is currently used in some places for winter driving only. Don't sell it around here in N. Tx.; just E-10. Seems like a big "pow wow" between oil companies, EPA, small refineries that can't produce ethanol gas, exports and who knows who else going on currently in DC.
I don't know if the plan is for E-15 to migrate down here or not.
Part of the pow-wow is the fact that a lot of small engines and marine engines (2 strokers of which I am aware) aren't rated for E-15. Going to be lots of objections in those areas.
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