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Message: <blockquote data-quote="RiderX" data-source="post: 1048794" data-attributes="member: 28667">Trying to figure out exactly what you're asking with regard to Google Miles versus FJR miles. Are you getting a IBA cert with your 1000 miles? Or is this related to the gas question cause you know how far you get (in FJR miles) per tank? If memory serves, my Gen II is generous with respect to miles by the tune of 2.5%. Google Maps, MapSource, MS S&T, mapquest, Delorme, Basecamp and many GPSs,  are a fine source for actual mileage. There will be some minor discrepancies but they are the best we have (That's why it's not a bad idea to ride 5% more for cert rides).So I think the answer to your questions is a 2.5 - 3% difference between an accurate mileage source and your FJR odometer. Various free smartphone apps will also give you accurate mileage (Waze, Garmin, Google) although I don't have a lot of experience with those.Could always do a known course and see what your factor is with a given tire, etc.Have a great ride!</blockquote>