Board Thread:Game Discussion/@comment-27109924-20161129030305/@comment-27798333-20170206001238

Welcome to the club. I've got most of these top cars fully upgraded, and still can't get anywhere near what some of these people are reporting. My best with the F XX K is 19.2 miles.

Make sure you save before upgrading, then try it. If you can't do any better after a few tries, restore.

IMO, it's not worth the expense.