Changing tire size could make both your speedometer and odometer off.
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Use or borrow a GPS for a day,..they are right on the money MPH wise.
Beats the heck out of going to a speedo shop at $85.00per hour. |
that's a good point about the odometer reading. We've switched from tall rubber to LP22.5's and I know our speedo's are off. Hmm. May have to rethink things here.
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When I checked my mileage on my 2002 international, I discovered That for every 7 actual miles ran showed up as 10 on the odometer. This truck runs perfectly and mechanics always comment on how nice the the truck runs with over 700,000 miles. I believe the engine only has around 500,000 miles,
Obviously I, and the previous owner has been over maintaining the engine wth oil changes and any other maintainance based on mileage. :lol: |
It isn't difficult to recalibrate the speedometer.
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I agree with GMAN, sounds like a change in tire size wasn't accounted for somewhere along the line.
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DaveP Look on your drivers side door jam on your IH it should have a sticker telling what size rims your truck came with.
Mike |
Doghouse is correct. Borrow a GPS, they are dead on accurate.
DaveP, being off 2mph is not a big deal. Thats 20 miles off at the end of a 10 hour day of driving. Chances are, your speedometer is the one that's off and not the odometer that records the total mileage. I know my speedometer doesn't always show the correct speed but I know the odometer is right on. I've done the calculations while driving using a timed mile at 60 mph and also with my GPS. |
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