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My Wife's Avalon has a control system that monitors avg Mileage, trip times, etc. Driving across Arizona, I was able to do some of those types of tests, and will confirm your findings. 80mph yielded a best of about 27mpg, while 70mph would do just over 30mpg.
I found it interesting that using the Cruise Control would give me about 1mpg improvement, even though I thought I was light on the pedal.
I would think tire pressures below 24psi would cut into mileage significantly.
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72 914 2056: 74 9146 2.2: 76 914 2.0
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