Forest River Sunseeker E450 2300 MPG

I use to have a 2300. I got 10 on a good day.

Having had both an E350 (25' MH) and E450 (28' MH), my experience is that the E450 gets slightly better mileage because (despite the difference in axle ratio) the E450 doesn't shift down as frequently while driving. I believe that's because the E450 engine is higher into the torque range and is able to negotiate hills better.
Usually avoiding Interstates and running 50 to 55 MPH, my mileage before towing was a shade less than 10. Towing the Focus it's slightly over 9.
In the Rockies and WV, the mileage is dismal.

For what it's worth, I average about 10 mpg in our E450 Sunseeker
2300. I do not drive with a lead foot, usually do about 60
on freeways . So far most of our travels have been in Texas , which is
pretty flat. Good luck with your new m/h.

Don't waste your efforts on trying to figure out a Canadian Imperial gallon....there is no such thing anymore....you will either be calculating fuel burn as "miles per US gallon", or "iitres per hundred kilometres"...all tank sizes are now shown in US gallons & litres...

I would be very happy with 10 MPG in a class C. However if you really wanted to drive 55 MPH, then 11 MPG might be possible.

I don't know why a E-350 would get worse mileage than a E-450 built to have a heavier weight, and also a higher number rear axle ratio (typically) because the design engineers wanted the E-450 to run at a higher engine RPM for each given road speed, than on a E-350. The engineers predict that the E-350 will have a lower GCVWR, and thus can run at a more efficient and slower engine RPM for a given road speed.

Anyway if you are looking at a 23' or 24' long RV, it should be much lighter than a "Typical" 30' class C with a heavier slide out. This will assist in getting better MPG. But I don't think that 12 MPG is possible with a gas engine today. There is actually 10% or more alcohol in the fuel, and that prevents cars from getting the MPG that they might on pure gas.

The best way to improve the MPG is to slow down. Setting the CC at 55 MPH will save a lot of gas compared to 65 MPG. Also buy a couple of tanks of 92 octane fuel. See if your MPG improves. If you are getting 10 with 87 octane, and 11 with 92 or 91 octane, then it is worth it to spend 5% more on the fuel to get 10% more mileage from each gallon. You will actually spend 5% less over a 1,000 mile trip by buying the higher octane fuel.

Fred.