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Old 10-26-2010, 09:56 PM   #8 (permalink)
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Join Date: Feb 2010
Location: Los Alamos, NM
Posts: 134

TBSS - '08 Chevrolet Trailblazer SS 2WD
90 day: 19.36 mpg (US)

Wife's car - '09 Chevrolet Impala SS
90 day: 22.96 mpg (US)

Big Blue Hippo - '06 Chevrolet HHR 2LT
90 day: 45.99 mpg (US)
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Sounds like a cool idea, but also quite involved.

My wife's '09 Impala SS has GM's 5.3L with cylinder deactivation and it does seem to work nicely on the highway. We averaged 29 mpg on a recent 1100-mile round trip. That was with two adults (and I weigh 240), 150 lbs of kids and the trunk loaded full-to-bursting with coolers and luggage going 75-80 mph the whole way (speed limit is 75).

That said, I'd be willing to bet that you'd be better off just changing out the rear gears to something taller. It would have a similar effect...reducing the number of cylinder fires per mile.
Daily driver:
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