Quote:
Originally Posted by Corts60
Check your speedo against a speed app on your phone. My 88 suburban speedo shows 3 mph slower than actuality because I run 31" tires instead of the factory size.
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Bingo.
Going the same speed as another vehicle doesnt mean the milage will match.
Especially if one or both of your speedometers arent accurate. A few MPH on both your trucks one way or the other can add up to... well... the difference in your milage and his milage for the same trip