Perhaps I've missed something, but I'm not seeing any way to enter my data using a combination of miles travelled and mpg. On a Prius (with a fuel bladder that can vary in capacity from day to day), calculating fuel efficiency based on the gallons filled can be very inaccurate. I could calculate the gallons used with a calculator and the odometer and mpg numbers, but that's enough of a barrier to entry that I suspect I won't bother. Any chance a third input type could be added?
@ebrandeis I have one of those HUGE tanks. 966 miles actually. It's because I don't have the data for the fuel up before that one. So it's calculating based on two tanks. Thus the discrepancy. I've already had a +1 vote for a checkbox indicating that there's a missing tank before the one you're entering. Should help with the problem.
German model Ford Mondeo missing... would love to compare stats. Any ideas if the Mondeo was marketed under other names worldwide? This is a great idea, I have been waiting for something like this for a long time