Recently I went 1700 something miles on a tank of diesel. I use Waste Veggie Oil but factor that into my mpg of purchased fuel. The last tank I did a lot of long trips which meant I went much further on a tank of purchased diesel. Anyway...the site figured out my mpg as 124 (which is correct) ... but leaves the distance part blank. Does it think the number is too far out of range and must be an error?
Yes, you ran up against our limit of 1500 miles/tank. Great that you're getting such great mileage! However, we need to have some reasonable limits in place. I'm guessing you are one of 1 or 2 people who can get over 1500 miles on a single tank in a sedan and not have that be a data entry error.
So we want to keep the limit in place which means you're going to be bumping up against the edges of how Fuelly works. You might need a different application that's built for more extreme hypermilers.