this post was submitted on 01 Jan 2026
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That math ain't mathing.
Assuming a "long drive" is at least 200 miles and most of the trip is on a highway without a lot of slow spots, you should save much more than 20 minutes a year regularly going 15 mph over.
With a lower highway speed limit of 60 mph, going 15 over will put you at 75 mph. In an hour, you're 15 miles further down the road going 75 than 60 and it will take you 15 more minutes going 60 to get to that same spot.
Specific conditions will change the numbers, obviously. I'd consider both a few hundred mile drive and driving through NYC during rush hour to be long drives and they'll have vastly different stats. By all means leave earlier but that Speedr app seems like it's mathing wrong.
The math might be correct it just doesn't reflect what it says. Its 20min saved compared to going all of the roads at the speed limit all the time.
So every time you slow down (because of trafic, a red light, a crossroads or for any other reason) the app will calculate you as going slower and "loosing" time. Of course you couldn't actually have gone the speed limit in those situations but the app can't know that. It actually can't calculate the time you saved.
But I can't find the app on fdrois so I can't check.
Not sure if it was taken off FDroid for lack of updates or something, but I've found the github here. https://github.com/jakehilborn/speedr
The math doesn't add up right. All I can go off of is my memory of the results after a year of driving in a way where I thought I was speeding often.