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Hello Folks
Newbe here I have read the 65 efficiency mods and noticed 2 I had missing. First increasing tire size. I have a 2006 grand caravan recently went from 225/65x16 tires to 235/65x16 tires all 4 corners. Yes the odometer is off by 6% according to my Garmin but built in mpg comp. is up 1 mpg plus the 6% mileage inaccuracy. Vehicle averaged upper 15s to lower 16s now upper 17s .The vehicle handles MUCH better as new tires are better weight rating and file in wheel wells much tighter. Yes the fronts rub...only during hard full lock turns at odd angles ie parking lot aprons typically at low speeds. run 37 psi front 35 psi rear both higher than door tag. This is realtivly cheap when u replace tires and numerically increases ur axel ratio better handling was a bonus but might not always happen.
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