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Originally Posted by kaisen
OBD2 speed could be exactly as inaccurate as the gauge....same inputs
GPS is more accurate because it isn't doing any math based on gearing, tire size, etc.
But you're right about the measurements and the 2%.... it's just a difference that your car cannot account for. Just pointing it out.
Some people can't understand why different tires make a difference in speed or fuel use.
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You got that right!
The contract guy in the cube across from me in San Diego was going to make a radical change in wheel and tire size. I asked him what he was doing to compensate in the speedometer. He had no idea it was going to screw up the reading. He called the wheel/tire place and they confirmed it would change the reading and no they could not adjust his speedo.
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Originally Posted by kaisen
Rolling resistance can make a big difference. Sounds like the LTX M/S2 does a good job reducing it.
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Yep, that is what I see. Seems a bit stiffer sidewall. I definitely like the increased mileage.
While I've got you here, how old do you have to get with an F250 Diesel before you get under $10K? My neice wants one in SoCal. She is towing a double horse trailer.