I messed around a little bit with 2.0. It looks like the bad conversions only affect data originally stored with 1.1 software as it thinks the numbers are metric and then reapplies the conversion factor. New data downloaded from the computer appear to be ok.
I also noticed that on the inital data import, the total miles field was converted incorrectly. I ended up deleted the computer and then reimporting the data, this time with the program already set to miles instead of the default km. Now the total miles shows correctly.