Quote:
Originally Posted by mpg_numbers_guy
Sounds like the engine is already pretty efficient in four cylinder mode, and that it's the acceleration (v8 mode, or is it s v6?) that knocks down your fuel economy. It was similar in the Sienna minivan my family had - could easily get 30+ on the highway, but around town it was easy to get low 20s unless you were careful.
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Also, yes haha.
It is night and day. When in v4 mode it gets amazing gas mileage, for such a large vehicle, and has plenty of power to get around but when it drops into v8 mode, I can barely get over 20 mpg on the hwy going 55 mph.
I wish I could have a push button to turn it from v8 to v4 mode instead of it being an automatic thing. I would basically already be at my goal with no mods if I could have a push button v4 mode.
It is the 5.3L small block V8 matched to a 4 speed with a 5th gear OD that drops the RPM to about 1,300 rpm at 55 mph which I feel helps improve mpg a ton.
My Corvette was the same way with the 6 sp manual. in 6th and 55 mph it would be about 1,000 rpm and getting in the 30's with the 5.7L v8 and no v4 mode.
Thanks again!