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Open Roads Forum  >  General RVing Issues

 > Identifing Fuel Economy factors

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chevor

US/Canada

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Posted: 02/22/12 12:43pm Link  |  Print  |  Notify Moderator

Im gonna start a list of things I think effect fuel economy of a vehicle pulling a trailer

Speed of vehicle
Wind- direction and speed
Aerodynamics of vehicles
Grade-Uphill or downhill
Tow vehicle tires- air pressure, tread type, size, rolling resistance, stability
Trailer tires- air pressure, tread type, size, rolling resistance, stability
Road Surface
Tempature
Weather-dry,wet roads, rain, snow
Time of day- sunlite, night
Engine- oil, air flow
Driver- Throttle use, acelerating, deacelerating
Hitch- stability, solidness
Suspension- stability
Weight- on each axel


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bid_time

Michigan

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Posted: 02/22/12 12:59pm Link  |  Print  |  Notify Moderator

Why - there's very few items on your list that you have any control over and even fewer still that have a measurable effect. Decreasing your speed and your throttle response will about sum it up.





chevor

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Posted: 02/22/12 01:22pm Link  |  Print  |  Notify Moderator

Do you know there are 18wheelers that pull 80,000 pounds and still get above 8mpg
How do you think thats possible?
THERE IS ALWAYS SOMETHING TO IMPROVE ON

extremis

BC

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Posted: 02/22/12 02:29pm Link  |  Print  |  Notify Moderator

I'd say pre purchase, you control vehicle selection; gears, engine, other truck specs, height and weight.
After purchase, its all in the right foot. Also route selection may help (less hills vs mountains, lower speed side roads vs interstate).
In the end, speed at 50mph (80km/h) would probably net the best mileage on most rigs. Also net the most road rage from other drivers.
Until manufacturers change how our trucks are engineered, we are stuck with what they offer.

Just Bob

SD/CT/FL/WY

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Posted: 02/22/12 02:40pm Link  |  Print  |  Notify Moderator

Type of road, ie: Super flat interstate--toll road--secondary road with traffic and stoplights.

OH48Lt

Whitehouse, OH

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Posted: 02/22/12 02:50pm Link  |  Print  |  Notify Moderator

Right foot, speed, and wind direction/speed are the three biggest factors in fuel economy when moving a large object down the road. Oil type can make a difference too (dino vs synthetic). I found my sweet spot on the highway pulling the 5ver with the F250 6.0 is around 62-64 mph. Higher and fuel mileage dropped off. Going slower didn't hurt, but didn't help much either. Battling a headwind could scrub off 2-3 mpg off the 11 I was getting while pulling. Being smooth with the right foot can make a significant difference.


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Posted: 02/22/12 03:13pm Link  |  Print  |  Notify Moderator

Delete


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skipnchar

Topeka or somewhere else

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Posted: 02/22/12 03:58pm Link  |  Print  |  Notify Moderator

Speed is the main thing you have control over. I've never seen MUCH difference in mileage between mountain driving and driving on the plains. Yes you get less mileage going up but much BETTER mileage going back down and USUALLY you eventually end up at the same elevation you started from. Many of the others on your list would be next to impossible, even under laboratory conditions, to measure any difference.


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downtheroad

Pacific Northwest

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Posted: 02/22/12 04:04pm Link  |  Print  |  Notify Moderator

I guess I can't argue with your list....but,
I quit worrying about fuel mileage years ago. Bad fuel mileage is part of the RVing experience. Once I accepted it I starting having more fun.

No matter what I did, I averaged Bad fuel mileage over years and years of towing.


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Fizz

Ottawa, Canada

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Posted: 02/22/12 04:37pm Link  |  Print  |  Notify Moderator

First and foremost it's SPEED.
After that it's all nickel & dime.
If you start worrying about the pennies, might as well park it.

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