I have nobody to impress, just working at my person goals for distance, speed, elevation... etc.

I've used GPS tracking for years, and I'm more concerned about over reporting than padded my stats. My 2016 Almanzo 100 ride was showing too much elevation in Strava (tracked with my Garmin 510), so I use a tool in Strava to 'fix' it.... it over corrected and the ride stands with 2,000 ft less elevation gain than is reported by the race organizers. Oh well.

Coming home from the 2015 Westside Dirty Benjamin, I was a few miles short of 150 miles and I wanted to brag about my 150-mile day. So I biked past the house and round the neighborhood to hit the round number. Funny part, Lisa was sitting on the deck and saw me go past and couldn't figure out why I rode past the house. She quickly guessed, she knows that I'm a stats-geek.

Most people I've encountered that exaggerate their stats are using non-GPS devices (ie Cateye), and haven't put in the correct wheel diameter. So they don't believe they are exaggerating, they just don't know they have bad data.

Beyond that, why would anybody want exaggerate their stats? You think you'll get a sponsor to pay to ride