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Old 07-25-2015, 07:08 AM   #11
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Gas milage with these rigs is what it is. There are no "magic" solutions to get much better. Your pushing a 12,000 lb box thru the air, possibly towing a toad, at 60-65 mph. Over a long period, slowing to 50-55 mph is really not going to save you a significant amount of gas/money, and if speed limit is 65-70 mph you become a hazard to other drivers.
As for obtaining your milage/gas use using the old "miles divided by gallons", get yourself a ScanGuage. Runs about $150 or less on Amazon. This will give you a true gallons used, milage per gallon, and an overall mpg per tankful. Reads directly from the computer. In addition the guage will monitor other engine info.
Many out there who claim 9-10 mpg would be shocked if they hooked up one of these and learn what their really getting
We have a 2012 Lexington, towing a 2013 Subaru XV. I average 62-65 mph, interstate, and usually average 6.5-8 mpg. Secondary roads with 55 mph I may average a bit more. My Lexi is in perfect tune, pressures checked at each trip, not overloaded, and I have a 5 Star Tune. Flat roads are obviously better, but pulling up long grades or mountains, I've seen it drop to 3.5-4 mpg.
Crummy gas milage is just a fact of life with this type of lifestyle. Just accept it, move on, and enjoy your rig for the reasons you got it.
Grumpy
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Old 07-25-2015, 07:26 AM   #12
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X2 Grumpy is right. The scanguage will give you a better read on your immediate mpg, you'll be able to find the sweet spot where you'll get the best mpg and more. Had it on my pickup and changed my driving to get better mpg
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Old 07-25-2015, 07:33 AM   #13
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For info, the Scan Guage will give you "real time numbers" so what your seeing is the actual numbers. You don't have to wait to fill up to get your mpg. It also monitors speed (mph) (you'll be suprised at how far off your speedo may be), water/coolant temp, tranny fluid temp, and a lot of other functions.
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Old 07-25-2015, 02:49 PM   #14
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The Ford chassis manual states to not measure MPG until you have 2 to 3 thousand miles on the engine as new engines loosen up and get better mileage after a few thousand miles. I have a 2015 3010DS and have been getting about 8.7 MPG so far without a toad but doing a lot of mountain driving.
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Old 07-25-2015, 04:01 PM   #15
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I have the Ultragauge em plus its about half the price of the scan gauge and has a bigger display it reads all the same stuff off the rigs computer
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Old 07-26-2015, 07:24 AM   #16
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Just hooked up Ultra-Gauge EM ($70) and believe it will help some. Driving thru hills of Pennsylvania can see actual gas mileage. Allowed me to adjust a bit and keep engine from kicking down on hills.

As noted, gas mileage is just part of the rent for exploring this great country in a fantastic camper. Enjoy the view and don't worry about the gas.

Sitting by the lake this morning!
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Old 07-26-2015, 08:53 AM   #17
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Remember when the light goes from Red to Green,,, do not try to be the first one to the next Red light ! Drive like you have an egg between your foot & the Gas pedal !
New motors LOVE fuel !!!
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Old 07-26-2015, 10:56 AM   #18
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Get the scan gauge. It really helps you get better mileage. It also tells you
a lot about your engine. Without it, I thought I was climbing the hills at a good
speed/rpm combination at 2400, but I found while climbing the Rockies with the gauge the most economical hill climbing is at 3200 rpm. On a typical weekend back here in SW PA I get 6.5mpg going to the Laurel Mts with a full load including water, AC on and a full tank of fuel. On the way back I get 8.5+.
I put a K&N air filter in this spring. It got my mileage up a couple tenths, and
I really noticed a big power difference. I can easily pass trucks on the inclines now.
The biggest saver as Wolverine said is taking it easy on acceleration. Getting out of
town is a real mileage killer so watch the traffic lights. As soon as they flip to yellow,
get off the gas and coast to the light. Hopefully it will turn green before you get there and you won't have to overcome as much inertia accelerating a 7 ton vehicle. Braking kills as much mileage as accelerating (because you used more fuel than necessary), so don't be in a hurry to get to the next stop light/sign.
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Old 07-26-2015, 11:07 AM   #19
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Make sure your tire pressures are correct and check your weight. Keep your speeds down 5mph will make a difference.
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Old 07-26-2015, 11:46 AM   #20
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Don't carry a lot of water in fresh water tank, make sure drain grey and black before you hit the road. Weight adds up at 8# a gallon. We usually carry a third. We set driving at 2500 rpms. And don't use cruise on hills as previously posted. This will use a lot of gas.
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