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Speedometer Calibration Question

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Hey guys. i recently put 16 inch 99LS rims on my 92LS which had 15's. my question is with the bigger wheels how off is the speedometer going to be, and lastly how much will these bigger wheels effect my calculation of gas mileage? i know its not going to effect the actual gas mileage but just figuring out how many miles i get to the gallon, ie....the trip odemeter, + or -

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More tire/speedometer, etc calculation sites {these are suppose to be links--but if they don't click, then ignore post}:

Various Automotive Calculators

Metric/English Conversion Calculator

Tire Size and Speedometer Error Calculator

Gear Speed Calculator

Horsepower & 1/4 Mile Calculator

Horsepower Calculator

Horsepower Correction Calculator

Wheel Size & Offset Calculator #1

Wheel Size & Offset Calculator #2

Tire Size Calculator

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