We have a 1999 Born Free (Ford Triton V-10) that we've driven over 80,000 miles in 6 years. Up to the 113K - 119K miles area, we were getting about 9.5 mpg. At 127K, we got misfires and, after changing coils etc. finally got a rebuilt engine installed. (We full time in the RV). The mpg had dropped at about 124K to 7.6 mpg or so. (I attributed this to the misfires, coil issues etc.)
After the new engine ($9K+) I had hoped to be back at 9.5 mpg or so. No such luck. After driving 3K miles on the new engine, we're still getting 7.6 mpg or so. The new engine got new Motorcraft coils from the old engine, engine came with spark plugs, and the only sign that there's anything wrong is an airbag light on (this was not the case immediately after the new engine got installed). I had purchased a bluetooth OBD interface which shows no errors. I did put on new tires shortly after the engine change, and run the same pressures as before. Same brand of tire. No other changes. Same weight, same driver,
Anyone have any ideas on how to get our old mpg back?
Thanks in advance!
After the new engine ($9K+) I had hoped to be back at 9.5 mpg or so. No such luck. After driving 3K miles on the new engine, we're still getting 7.6 mpg or so. The new engine got new Motorcraft coils from the old engine, engine came with spark plugs, and the only sign that there's anything wrong is an airbag light on (this was not the case immediately after the new engine got installed). I had purchased a bluetooth OBD interface which shows no errors. I did put on new tires shortly after the engine change, and run the same pressures as before. Same brand of tire. No other changes. Same weight, same driver,
Anyone have any ideas on how to get our old mpg back?
Thanks in advance!