Eycom has told you the shortest route from Buffalo to Disney world. We travel that same route from Pittsburgh every year. The Wytheville, VA area where I 81 and I 77 are the same route there are tow Flying J's and also the cheapest fuel in the area, next fuel stop for us is just south of Charlotte in SC there is another Flying J. the next stop is usually at either exit 3 or 1 on I 95 in GA. Fuel around Orlando is not to bad, there are Hess gas stations on Disney Property that sell for the same price as anywhere else and they are RV friendly. Of course Hess was recently sold so the stations may be changing names. We usually stop at one of tow places between Pittsburgh and Disney, on I 26 around Orangeburg SC there is a little CG called Sweetwater Lake, no amenities but the price is right. OR we like to stop at Green acres on I 95 close to Hardeeville SC, around mile marker 56. Both CG's have lots of pull throughs. I try to avoid I 95 as much as possible, parts of the road in NC and SC will shake the fillings out of your teeth and the traffic is flying and very RUDE. FYI don't go through Charlotte at rush hours, Pittsburgh area can also be a challenge at rush hours, Charlotte definitely is!