Forum Discussion
pnichols
Mar 08, 2015Explorer II
All V10 powered Class C motorhomes are not the same, i.e.:
- Earlier V10 engines were lower horsepower than later ones. Perhaps the earlier ones are capable of slightly better gas mileage.
- The E350 version is geared taller and may be capable of slightly better gas mileage than the E450 version.
- A smaller (lighter) V10 Class C may be capable of slightly better gas mileage than a larger (heavier) V10 Class C in intensive slow-down/speed-up travel situations where frontal air resistance isn't so dominant a factor.
Average highway travel speed is very important for any Class C's gas mileage, due to the air resistance coming from it's frontal area.
We have, I estimate (we don't track it accurately), achieved around 10 MPG under very special circumstances with our E450 V10. Our Class C is a short one, no slides, I cruise between 55-58 MPH most of the time, and I have larger diameter tires on it that make all gears taller (and closer to E350 ratios) ... including making it's over-drive gearing ratio taller than what you get with stock tires.
I do not have solar panels on the roof. Roof solar panels increase air resistance slightly. However, I do have vent covers over it's two vents. Vent covers increase air resistance slightly.
As a side note, the later Ford V10 E350's and E450's have the 5-speed (6 speeds internal) TorqShift transmission in them. This transmission has a Tow/Haul mode. I've never seen a careful comparison of the gas mileage difference (if any) between leaving this transmission in one or the other of the two modes. Since a Class C motorhome is hauling it's weight all the time (unlike a delivery truck), leaving the TorqShift transmission it in the Tow/Haul mode all the time could conceivably provide slightly better gas mileage ... since in this mode transmission slippage during acceleration and uphill pulling is probably reduced. Transmission slippage wastes gas.
- Earlier V10 engines were lower horsepower than later ones. Perhaps the earlier ones are capable of slightly better gas mileage.
- The E350 version is geared taller and may be capable of slightly better gas mileage than the E450 version.
- A smaller (lighter) V10 Class C may be capable of slightly better gas mileage than a larger (heavier) V10 Class C in intensive slow-down/speed-up travel situations where frontal air resistance isn't so dominant a factor.
Average highway travel speed is very important for any Class C's gas mileage, due to the air resistance coming from it's frontal area.
We have, I estimate (we don't track it accurately), achieved around 10 MPG under very special circumstances with our E450 V10. Our Class C is a short one, no slides, I cruise between 55-58 MPH most of the time, and I have larger diameter tires on it that make all gears taller (and closer to E350 ratios) ... including making it's over-drive gearing ratio taller than what you get with stock tires.
I do not have solar panels on the roof. Roof solar panels increase air resistance slightly. However, I do have vent covers over it's two vents. Vent covers increase air resistance slightly.
As a side note, the later Ford V10 E350's and E450's have the 5-speed (6 speeds internal) TorqShift transmission in them. This transmission has a Tow/Haul mode. I've never seen a careful comparison of the gas mileage difference (if any) between leaving this transmission in one or the other of the two modes. Since a Class C motorhome is hauling it's weight all the time (unlike a delivery truck), leaving the TorqShift transmission it in the Tow/Haul mode all the time could conceivably provide slightly better gas mileage ... since in this mode transmission slippage during acceleration and uphill pulling is probably reduced. Transmission slippage wastes gas.
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