Instead of moving the upper limit, I added the confirmation step today. So this time when you enter 1703+ kilometers, you should get this warning message:
"Looks like the number of kilometers you entered is unrealistic for a single tank. If you really went 1703 kilometers for this tank, click Fuel-up! below to bypass this check."
Click Fuel-up! again, and Fuelly should add the fuel-up. It's a bit of a pain since you have to go through that extra step, but most people won't be getting that kind of distance from a single tank. So we have the check there with a way to get out of it.
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