En route we use Gas Buddy app on the iPhone to plane the next fuel stop. The we use Google Maps (and/or Google Earth) to determine whether we can get in and out of the proposed fuel stop. Gas Buddy also helps to keep you from getting gouged.
The all we have to worry about is whether the fuel has an acceptable level of bio in it. Vehicle manufacturers have different specs on what biofuel you an use in them. Some truck stops are pumping B20 from what I have heard. Check your manual.
Here is some info on what the vehicle manufacturers say about bio in their vehicles.