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Old 09-01-2016, 10:45 AM   #15
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I'm getting about 11 mpg towing a 36 foot fifth wheel weighing 11K lbs. (dry.) When I last towed my 31' travel trailer, I got about 14 mpg with my 2003 F250 7.3 diesel.

All the modern gasoline truck engines are relatively high rpm engines, and they're going to be hunting for gears in hilly conditions. It's just how they are. Doesn't mean they're not going to do the job for you.

If I was buying a new 3/4 ton truck today, I'd skip my Lariat leather interior and buy the cloth XLT interior with a diesel engine. It's just about a 1:1 trade off for a diesel engine. Ram and GM has comparable interior packages too.
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Old 09-10-2016, 10:01 PM   #16
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I was also going to say slow down and enjoy the ride to save gears.
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Old 09-14-2016, 04:41 PM   #17
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Interesting thread. I have a Ram 1500 with the 3.0L diesel. I've only towed in the Phoenix (Keystone Bullet 26RBPR) area so far, not done any mountains. Still, I probably average 15mpg. Unloaded I get between 28 and 30 on the highway.
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Old 09-14-2016, 08:07 PM   #18
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A diesel is night and day better for towing than a gasoline truck.
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Old 09-14-2016, 09:45 PM   #19
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Go drive a large gas class A pulling a toad, 8+ mpg and 3rd gear on a mountain only occurs when going down the mountain.

If your worried about mpg keep, your speed under 55 mph, also use momentum to go up the hill and be very light of the gas.

Single digit mpg and low gear climbing hills is as others stated how a gas engine works
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Old 09-14-2016, 10:12 PM   #20
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Since we are on fuel economy here is a test I'm doing on the 5 star $2400.00 kit with the tuner, exhaust and I thought a cold air kit. I'm not bashing 5 star but when I received my hardware all I had was a k&N air filter. This was all done on the phone, I didn't look at their site first so the misunderstanding is my responsibility but the guy on the phone said cold air kit. Oh well.. I'll call tomorrow. My problem was 5 mpg on three trips average. this average was taken while running a K&N air filter, 93 Non Ethanol, good tire pressure and pulling a 6 x 12 enclosed v nose single axle trailer with three dirt bikes. I kept my speed to 60 and below and tried to use momentum on the hills.
I'll add results after tuning and adding the exhaust. I'll probably have to buy the cold air kit. I might add E3 plugs as well. I hear they break off in these v10s for some reason so I'd rather get the stockers out and add some high temp anti seize before there is a problem.
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Old 09-14-2016, 10:18 PM   #21
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One other explanation for your experience:

A non-turbocharged gasoline engine, will lose about 3 percent of its rated power at a given RPM for every 1,000 feet of altitude gained due to air getting thinner as altitude rises. So to overcome a grade at higher elevation the engine must run at a higher RPM to generate the same horsepower required to maintain a given speed.

Production diesel truck power at any given RPM does not change much with altitude up to 10,000 feet for several reasons primarily because of turbocharging benefits and the fact that diesel combustion power is more forgiving of fuel-air ratio change than gasoline combustion power is.
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Old 09-14-2016, 10:50 PM   #22
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Quote:
Originally Posted by powercat_ras View Post
One other explanation for your experience:

A non-turbocharged gasoline engine, will lose about 3 percent of its rated power at a given RPM for every 1,000 feet of altitude gained due to air getting thinner as altitude rises. So to overcome a grade at higher elevation the engine must run at a higher RPM to generate the same horsepower required to maintain a given speed.

Production diesel truck power at any given RPM does not change much with altitude up to 10,000 feet for several reasons primarily because of turbocharging benefits and the fact that diesel combustion power is more forgiving of fuel-air ratio change than gasoline combustion power is.
I have experienced that feeling but only on a motorcycle in the Smokies. My travels thus far in the Class C have been between 200 and 600 feet.
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Old 09-16-2016, 02:53 AM   #23
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Previously I was pulling a 5000 lb fith wheel with a Dodge 5.7 1500 SWB. I always got,around 14 mpg with it and never lacked for power.
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