Quote:
Originally Posted by MrPace
There have been rather extensive tests conducted in other threads on this site which have confirmed that not only don't you take a hit on MPG with AFM disabled, in some cases, you actually get BETTER MPG with the RANGE installed.
Driving up and down hilly terrain, where the 4 cylinder struggles just before it shifts back to 8 cylinder mode might be one explanation.
AFM does little to nothing to improve gas mileage in the Camaro...sad, but apparently true...sad because it most certainly does have a noticeable affect on performance (in terms of feeling/hearing the AFM kick in, and not just when you are cruising at highway speeds...if it ONLY did that, it would be tolerable).
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Have it on our Suburban. No effect on MPG. Actually went up a little for first few months according to the computer, now same as usual 13.4. Lifter noise at startup has gone away - I think we caught it in time (70k miles).