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Getting back on topic -- how do you make an engine run 10% more efficient?
A "tune" doesn't affect compression ratio, or decrease internal friction (not directly anyway). So what's left? Does it run engine that much leaner? Does it change spark timing? If so, why doesn't Ford do it also?
I know 10% change in BSFC is very significant, and Ford engineers wouldn't simply ignore that much in fuel savings unless they thought it could harm the engine, it adversely affected drivability, it adversely affected emissions, or they are so ignorant they don't know the difference.
I would personally not bother with this for fear of potential damage in the long run that may add more cost than I'd be saving in fuel.
If the average motorhome is driven about 5,000 miles a year, and it burns 700 gallons of fuel a year, then saving 10% is about 70 gallons a year. At today's fuel cost that's about $140 per year.
Compared to all other costs of motorhome ownership, that's almost trivial.
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