I am just guessing here but the moderate change in final drive ratio that you get with a taller tire is not enough to offset the increased power (read more gas) a larger tire takes to turn.
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt.
"Friends call me cruzer cuz I like fast cars and fast women"
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