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Old 07-31-2012, 12:09 AM   #1
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2012 george town 378

What speed have you found works for best mileage,i toll a 4000lb truck.I get a little over 6mpg,have 2500 miles on coach.
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Old 07-31-2012, 12:18 AM   #2
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What speed have you found works for best mileage,i toll a 4000lb truck.I get a little over 6mpg,have 2500 miles on coach.
I have found my sweet spot is about 2,200 rpm's. That rpm's under different wind conditions around 60-65 miles per hour which get me in the mid to high 7 mpg range pulling my toad on all 4 wheel. The best I have gotton without a toad was 8.8 mpg but It was all highway and running around 60 miles per hour and very light on the peddle. I have almost 7,000 miles on my 2012.

The mpg is not the same in all and depends on drivers, wind conditions, octane of fuel 85 -87 or higher and how many 6% to 10% hills you have to climb, maintaining proper tire pressures, etc.
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Old 07-31-2012, 08:17 AM   #3
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I have found my sweet spot is about 2,200 rpm's. That rpm's under different wind conditions around 60-65 miles per hour which get me in the mid to high 7 mpg range pulling my toad on all 4 wheel. The best I have gotton without a toad was 8.8 mpg but It was all highway and running around 60 miles per hour and very light on the peddle. I have almost 7,000 miles on my 2012.

The mpg is not the same in all and depends on drivers, wind conditions, octane of fuel 85 -87 or higher and how many 6% to 10% hills you have to climb, maintaining proper tire pressures, etc.
What Iggy said...........
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Old 08-01-2012, 12:41 PM   #4
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My 2011 378 does about the same as Iggy's, just a little less pulling an HHR.
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Old 08-01-2012, 04:14 PM   #5
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I'm curious to find this out on mine. With the instant MPG on the ScannGaugeII I installed (or a Germin EcoRoute) this should be easy to see. Set the cruise to various speeds on level ground on a calm day and see what your instant MPG is.
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Old 08-01-2012, 07:58 PM   #6
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I'm curious to find this out on mine. With the instant MPG on the ScannGaugeII I installed (or a Germin EcoRoute) this should be easy to see. Set the cruise to various speeds on level ground on a calm day and see what your instant MPG is.

All my calculations are done by hand and not a dash computer.
The only variable is how you fill your tank with fuel so you can be consistant with your full tank measurement.

I fill my tank slowly until it clicks off the automatic fill on the handle and then continue to fill until the next full dollar. If you do this each time you will get a balanced full tank measurement so you can then get a more accurate mpg reading.
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Old 08-02-2012, 01:09 AM   #7
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Fellow campers.
I am very pleased with an 8.5 mpg average over a 400 mile long, steep hilly drive on I-5. A question that came up for me on the drive was, is it better on the engine and transmission to run the hills in higher rpms, and not load the drive train, or let the rpms run down a bit under 4000, but this puts a load/lug on the engine and transmission. I felt like the lower rpm and load on the engine and transmission heated everything.
Not being an expert at all in this area, I thought some of you out there would be able to put a better light on this for me.
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Old 08-02-2012, 08:47 AM   #8
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Fellow campers.
I am very pleased with an 8.5 mpg average over a 400 mile long, steep hilly drive on I-5. A question that came up for me on the drive was, is it better on the engine and transmission to run the hills in higher rpms, and not load the drive train, or let the rpms run down a bit under 4000, but this puts a load/lug on the engine and transmission. I felt like the lower rpm and load on the engine and transmission heated everything.
Not being an expert at all in this area, I thought some of you out there would be able to put a better light on this for me.
No experts here but when I see a hill I increase my speed depending on the hill size and length. Last month I had to go over the Tetons Pass west of Jackson Hole. Elevation 9,000 ft with a very steep 10% grade and is about 10 miles to the top.
I really had to get on it to maintain 45 mph but this engine and transmission did it. If I didn't get on it I would have had to drive it at 5 mph with high rpms which I didn't want. When climbing if you loose your rpms you are dead in the water and will creep up very very slowly.
Now I talking a very extreme pass and not just a small hill.

On the highway hills are much more gradual and you still have to increase speed before you get to the start.

Just watch the semi's and see how they do it. The Ford V10 has a governor on it and will not allow you to go over 75 mph.
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Old 08-02-2012, 10:49 PM   #9
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The way I check my MPG is I go thru the dash menu to "remaining miles". If I have a full tank I divide by 80, 3/4 tank divide by 60 and so forth. I believe the remaining miles is based on the past 500 miles of driving experience. I get around 7 towing a van on a dolly. I tend to drive 65-70 which I'm sure hurts the MPG.
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Old 08-03-2012, 12:08 AM   #10
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The way I check my MPG is I go thru the dash menu to "remaining miles".
My 2008 (on a 2007 chassis) doesn't have that. Pretty cool that they added it. What else does it do?

All my in dash screen displays is Odometer, Trip Odometer and Engine Hours. Just those three, kinda lame.
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