I say a good days drive of around 350 miles is good target if you are on a multi-day tour that you need to get somewhere to (all on secondary roads - no interstate). That's about 2 1/2 to 3 tanks of gas. I did Elkins, WV to Hampstead, NC in one day about 465 miles in the summer heat and it was not fun. I wanted to get home and I was driving by myself - no wife to contend with
