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This is a little off topic too, but for engine that already have the fuel cutoff it would be nice if there was a way to manually switch it to lower displacement. My mother in law has a GMC Yukon with the flex fuel engine that can switch from 8 to 4 cylinders, but she complains that it still gets horrible gas milage. So a couple weeks ago, I got the opportunity to drive it and was ready to see what I could do with it since I figured she was heavy footed with it. It NEVER switches unless the vehicle is COASTING. I used the cruise on flat ground all the way down to 45mph and it still never switched. Anything below 45 and the TC unlocked.
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