what is the difference? I ahve been looking at now F150's and I see there is 2 different engine classes..... FV and FFV..?

 

I dunno where you saw "FV," but "FFV" stands for Flex Fuel Vehicle. The engine of said vehicle is capable of running E85 ethanol in addition to regular unleaded gasoline. Non-FFVs cannot run any more than about a 10% ethanol content fuel.

 

Thanks.... kind of makes me feel stupid after the easiness of it , lol.