[cleanspeed1]

If you want to keep the V10 powered rig, there are some engine mods that you can do that are all bolt on. A set of headers and a complete free flow exhaust system is a good start. After that, call dpTuner up for a custom tune for the ECM ( help with the power and mileage ).

Do a search on this site for others with motorhomes and doing mods, there are a couple here that range from a smaller rig to a full size unit.

Me personally, the answer is "go diesel!" The Ford V10 will never be great on the fuel, even though it pulls well.

You can use the Hypermiling Techniques and the Efficiency Mods as a start and get a Scangauge so that you can modify your driving technique for better mpg.

Change everything from engine to rear differential to synthetic lubricant.

A longer term solution is to switch to a diesel C class motorhome; maybe a Sprinter based unit.

Or, if you are feeling frisky, take the V10 out and swap in a common rail Cummins 5.9 or 6.7 out of a Dodge pickup. DeStroked makes a kit for the Ford F Series pickup, so with a couple of changes it should slot in. The Common Rail is a lot quieter than the earlier units, and very tuneable. Plus with 600 plus ft/lbs of torque lower in the powerband, it will not have any problems moving anything along.

But then again, there is that Vanhool or Prevost calling your name!