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This is fascinating to me. I have a 2004 Matrix XR, FWD, Automatic. I had assumed that my best fuel economy would come in my highest gear, after torque lock-up, at the lowest possible RPM--this equated to about 37 mph. Then, empirically (without a scan-gauge), I found that a slightly higher speed than the lowest possible RPM speed in this condition produced a better result--45 mph or so yielded better fuel economy. Your test results concur with my rough finding. What is astonishing about your result is that 24.9 mph--which must occur prior to torque lock-up--is an even better efficiency speed! Remarkable. Please tell me if I'm interpreting your results incorrectly. I know have 25 mph and 45 mph marked in my mind as my efficiency target speeds. Thanks for the work. Steve
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