Quote:
Originally Posted by UFDUB
Best option is just use GPS to measure actual speed vs indicated and note the difference (it’s a fixed percentage). Use waze or other navigation is an easy way. Best way to tell actual speed so you can really know how far off you are
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My suggestion as well. When I GPS'd mine it was dead-on with the car and I was on a shorter tire (305/30 > 285/35) not a huge difference but shorter. assuming too that GPS was accurate.
My girls jeep with 22"s/35" tires is off by 4mph (faster).