Gas mileage E450

Jbrowland wrote:
Interested to know if the E350 performs the same MPG wise as the 450? I have the E350 and consistently average exactly 10mpg at the end of a trip from say LA to Yosemie Valley and back doing an average of 59mph or so. I also have a 24 foot class C RV so I am likely lighter than the 30 ish footers discussed, although I would assume the E350 has to work a little harder on the hills than the 45o does?

Actually the E350 does not work as hard as the E450. Same engine/drivetrain but a lot less weight and a taller differential. Our 2012 has a GVWR of 11,500 the 2013's and newer are 12,500 while the E450's are 14,500.

We have had our Nexus Phantom 23P (24'), E350 for nearly 3 years and 30,000 m miles and we consistently get 9.5 including some generator time. The ride is smoother than an E450 and we have plenty of payload (3,363#). On a class C under 25' the E-450 is overkill... still a fine coach but the rougher ride and diminished fuel economy bring few benefits to the equation.

As always.... Opinions and YMMV.

:C

Interested to know if the E350 performs the same MPG wise as the 450? I have the E350 and consistently average exactly 10mpg at the end of a trip from say LA to Yosemie Valley and back doing an average of 59mph or so. I also have a 24 foot class C RV so I am likely lighter than the 30 ish footers discussed, although I would assume the E350 has to work a little harder on the hills than the 45o does?

jrobert01 wrote:
Well i worked for my money and i like to take care of it any way i can and the more gas mileage the better.That said i must be the worst driver or the worst something.I have had several motor homes over the past 30 years except for the Toyota i never get more than 7 and i drive 55 or 62 on interstate brake slowly accelerate slowly and try to get the best mileage i can but that is my best.I have a 2008 32ft.four winds and i live in Tn.Do a lot of long trips. Tell me why i get so much less mileage than everyone else.Lets go with the sarcasm.

2008 Fleetwood 32' 8 mpg at 62 mpg. I just accept it as part of RVing. If the roads are hilly it drops to 7.

Yes Sam, I corrected for the odometer error.

Sam Spade wrote:

pianotuna wrote:
This gives me about an 8 percent error but also boosts me to 11 mpg @ 48 mph.

I hope you are figuring in that 8 percent error when calculating your gas mileage too. The ODO likely is also off by the same amount and can not be used (uncorrected) for MPG calculations.

pianotuna wrote:
This gives me about an 8 percent error but also boosts me to 11 mpg @ 48 mph.

I hope you are figuring in that 8 percent error when calculating your gas mileage too. The ODO likely is also off by the same amount and can not be used (uncorrected) for MPG calculations.

Hi Phil,

Wow what a memory you have. Mine are 235/85r16 which replaced the OEM 225/75R16 This gives me about an 8% error but also boosts me to 11 mpg @ 48 mph.

pnichols wrote:


Don ... I've never reset my E450's speedometer.

According to the tracking of our Garmin navigator unit, our speedometer reads about 0.5 MPH low ... which is pretty much trivial. I don't tightly track our gas mileage and drive well below speed limits, so speedometer accuracy is not that important.

However, I believe that your over-stock-diameter tires probably introduce a more (serious) speedometer error? (My 215/85R16 tires are only 1.2 inches larger diameter than the stock tires that ship on most Chevy/Ford/Sprinter based Class C motorhomes.)

pianotuna wrote:
Hi Phil,

Were you able to have your speedometer/odometer reset so the readings are accurate? Or did you just ignore the difference?

pnichols wrote:

Nevertheless I do still improve our V10's fuel mileage just a bit by using larger diameter tires on our Class C (to make overdrive even more "over") and by cruising between 57 and 60 MPH.

Don ... I've never reset my E450's speedometer.

According to the tracking of our Garmin navigator unit, our speedometer reads about 0.5 MPH low ... which is pretty much trivial. I don't tightly track our gas mileage and drive well below speed limits, so speedometer accuracy is not that important.

However, I believe that your over-stock-diameter tires probably introduce a more (serious) speedometer error? (My 215/85R16 tires are only 1.2 inches larger diameter than the stock tires that ship on most Chevy/Ford/Sprinter based Class C motorhomes.)

I use Excel spreadsheet to track mileage on all of my vehicles, a tab for each. You can get apps that will do that too. I keep track of miles, quantity, total ODO reading, what station, brand, location, etc and it figures the cost per mile also. I can tell you if one station gives me unusually bad or good mileage over other stations or gas.

Sounds OCD but I started it in Oct of '11 when a new to me car that I bought was particularity difficult to fill up consistently from one fillup to the next. I can see the distinct difference between summer blend and winter blend gasoline and tell you within a week when they switched.

It is now something that I just do, and its kinda neat to see what the car will actually do.

Charles

To jrobert- do you ever get extended time on flat windless interstate going 55-62? For me those miles are what pulls the average up. Otherwise, most other driving conditions are pretty dismal for MPG. Headwinds, city stop and go, mountains with acceleration and braking, etc.

Well i worked for my money and i like to take care of it any way i can and the more gas mileage the better.That said i must be the worst driver or the worst something.I have had several motor homes over the past 30 years except for the Toyota i never get more than 7 and i drive 55 or 62 on interstate brake slowly accelerate slowly and try to get the best mileage i can but that is my best.I have a 2008 32ft.four winds and i live in Tn.Do a lot of long trips. Tell me why i get so much less mileage than everyone else.Lets go with the sarcasm.