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I did a test with afm on and off just for gas milage sake. I drove a back to back test for 20 miles going exactly the same useing cruze control. same same so it is a valid test. gas milage IMPROVED in v8 mode only like 1.5 mpg. That is average small grades ect on 4 lane hwy at 70 mph. I was shocked to say the least. I guess the power to weight raito is such that it labors more in v4 up small grades i dont know, i do know the test is valid and repeated. It helped me to decide
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