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Current GPSes are accurate to within 15 meters (~50 feet). That's not much error over a 10 mile distance. The different map databases and programming algorithms used by the GPS companies probably introduce more error. I know my Tom Tom GPS isn't nearly as user friendly displaying trip distance as my Garmin GPS or the Magellan I gave to my niece.
I've found mile markers to be notoriously inaccurate. The highway workers and contractors will straighten a road, and move milepost 3 to the 2.8 mile location. Highway departments used to have speedometer test sections. I haven't seen one in decades.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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