I get similar numbers with the way I usually work it out but you may find this way easier in the future -

The conversion factor you're after is Actual/Measured.

In your case that's 10/7.6 = 1.32

You can recalculate that if you do what Erik suggests and take some more readings. Then you just need to multiply any speeds/odometer readings by 1.32 (or whatever you get).

60mph x 1.32 = 78.95mph

12m x 1.32 = 15.79m

Don't ask me any more maths questions, I only know this one because I haven't managed to fix my fuel gauge yet.

EDIT: I haven't had a coffee yet and I just realised my 1.32 is the same as your 32% but this may be another way of working it out!

Last edited: Jun 15, 2011