Here is an in-depth article on MPG and tires. there are a couple of interesting diagrams on page 40 that show where energy losses occur in automobiles.. There is also reference to road surface effects on MPG
Tires and MPG
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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