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Started driving north from West Melbourne Florida with the hopes of making it to Manistee Michigan to visit my son and his family. First fillup after leaving Melbourne (gas gauge only goes to 1/2 of a tank regardless of being full) and subsequent fillups indicated consistent 10 mpg - nothing more. Maximum speed was 55 miles per hour due to tire hop above 55 (tires may be out of balance) plus the transmission continually downshifted out of overdrive going up hills and with headwinds, etc. Bought this RV about a year ago, had a new timing belt professionally installed and it runs and starts like a top except for the performance as previously stated. Any ideas on what could be wrong? We actually turned around and headed back to Florida after four hours of Atlanta Georgia gridlock. Coming home we took the Florida Turnpike from Interstate 75 and I filled up twenty miles before getting to the turnpike entrance. I should have stopped for gas at one of the turnpike plazas but figured I could make it to the 528 exit which was almost a disaster. When we finally got to a gas station along State Road 520 I had a whole 1/2 gallon left in the tank and the fuel gauge was below empty at that point. Finally got to see some movement in the gas gauge. I was stopping to fill up every 100 miles not knowing the gas gauge worked once the tank got below the 1/2 mark. This was a learning experience more than anything. The fuel consumption is my main concern. Any suggestions would be very helpful to me.