Quote:
Originally Posted by mcrews
I'd spend more time finding the 'upsize' that helps to get the best mileage....but that's me.
You can buy used garmin gps all day for $50-60. And get the exact mph without trying.
I realize some are obsessed w/ the speedo being 'correct' but that is 'limited inside the box' thinking. If you can pick up 5-7% taller tire and drive down the final rpm at cruise.....why wouldnt you?
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I just had this conversation with my wife about her Subaru... she'll go for strictly accurate OEM gauges all day. I tested her OEM tire/ODO combination yesterday: 99.6% accurate against the Garmin GPS.
Tested my own car further today: OEM odometer showed 21.7 when my calibrated Ultra Gauge showed 23.01 and Garmin showed 23.0 for 94.35% accuracy OEM to GPS. That's a 5.65% undercount, and I have been calibrating my fuel log at 5.5%.