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Is there a chip upgrade, performance chip, or anything like that that I can do to my RV to boost the power a bit, increase the miles per gallon, increase the HP, and increase the torque?
Lol, J/K. Nice motorhome, BTW. I am sure that a Banks tuner will work on your rig, as long as they use the same motors as the SD trucks. Past that, anything you can do to increase horsepower but not increase fuel burn will increase mileage, so an exhaust would be a good option, too. Lastly, remove anything that you don't use that weighs you down and make sure your tires are inflated properly and your engine serviced in correct intervals.
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Welcome to FTE MyBrokenJeep
We can help out. We have helped many RV owners with their V10 rigs. Class A and Class C. See our website for more info... Got a V10 RV? section.
There are very few ways to simultaneously increase MPG, power, etc.
The V-10 straight from the factory is pretty well tuned, you can tweak it around the edges, and get a sustainable single to very low double digit improvement without major rework.
The bottom line is, if you really wanted more power, economy, etc. you needed something built with a bona fide medium or heavy duty diesel on a medium or heavier duty frame.
Even then, you are limited by the reality of only having so much energy per gallon of fuel, and against that, weight, air resistance, etc.
No matter what you do legally, you're dealing with an EPA compliant engine burning crappy EPA fuel.
I just recently began thinking of going from our Jayco Eagle to one of their MHs but am really surprised that, from what I've seen so far, which isn't a whole lot, they are not offering a diesel in their Ford chassis. No faith in the 6.7? I'm pretty sure I won't go with the big Ford gasser. No excuse, I just gotta have an oil burner. Haven't priced the Seneca. Ouch.
There's a bit of good news for you though. You can buy a lot of gas with the money saved over a diesel if it had been available in the E450s. Just guessing, you're gas penalty is only the difference between 7.5 and ten or so mpg with the diesel, LESS the half a buck a gallon diesel price differential. As for power, well, take it easy and enjoy that nice rig.
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Trade it in for one of these. 
SCT Custom Tuning Dealer
