Even though I prefer the Ford V-10, the 8.1 is an excellent engine in my opinion and would not object to owning another one. We had the 8.1 in an '04 Tiffin 37DB and I had no problems with it. On a good day, we got 8.5 to the gal, but on one trip bucking a head wind we got only 5.1. I don't think a V10 would have done any better that day.
Stan, Shirley & 2 Schnauzers (Sandy & Sassy)
RV: 2014 Itasca Sunstar 35F
USAF, Retired, Life Member: VSPA, DVA, VVA, VFW