Is 12 mpg an acceptable number? - Page 6 - Escape Trailer Owners Community

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Old 06-19-2014, 09:18 AM   #51
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Jim,
Could it be the wrong gear in the rear axle? Does your truck have 4 wheel drive? What do other Dodge Hemi owners get while driving/towing?
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Old 06-19-2014, 09:41 AM   #52
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Originally Posted by Brian B-P View Post

Increased diameter doesn't cause higher fuel consumption, but it can seem like there is a reduction because your odometer reading is low: you underestmate how far you are going on a quantity of fuel.
Brian, I'd forgotten about that effect, and you're quite right. What I was thinking about was that by upsizing your tires you're effectively changing your gear ratio. I believe that most manufacturers are carefully matching the tire size and differential gear ratios on their base model vehicles to achieve the best mileage, among a few other concerns.
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Old 06-19-2014, 10:27 AM   #53
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Over the last 3 years of towing & 48,000 miles, I've averaged just under 15 MPG US. Of course I'm cheating & pulling a 17B!
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Old 06-19-2014, 10:30 AM   #54
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When I need new tires I will likely go with a 35" tire which is larger than the stock 33.5" and I fully expect to use more fuel. I haven't met anyone who hasn't had a drop in fuel economy because of an increase in tire size. The vehicle will sit higher, the tire will probably be heavier and the larger diamter will change the final ratio. In my case the speedo should be dead on at 100km/h with the increase. If not I'll have the Ford tech reprogram the "computer".

Back to the topic. 12 mpg isn't so bad for a hemi towing. I'm usually in the 14 mpg US range with the truck loaded with 3 dirtbikes and one quad on top of the deck and the box full of gear.
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Old 06-19-2014, 11:43 AM   #55
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Originally Posted by daveandsandyclink View Post
Jim,
Could it be the wrong gear in the rear axle? Does your truck have 4 wheel drive? What do other Dodge Hemi owners get while driving/towing?
I do have 4 wheel drive and 20" wheels/tires and a 3:55 rear end. There is a cap over the bed which should help aerodynamics. I think it is weight and just the engine, over on Ram forums and other rv forums, some people get 8-9 towing? It does have the mds which shuts down 4 cylinders and that sometimes happens while towing on a flat run and not in tow mode. Then the instant mpg increases to about 18 mpg.
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Old 06-19-2014, 12:10 PM   #56
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Originally Posted by davescape View Post
What I was thinking about was that by upsizing your tires you're effectively changing your gear ratio. I believe that most manufacturers are carefully matching the tire size and differential gear ratios on their base model vehicles to achieve the best mileage, among a few other concerns.
Good point, but depending on individual driving conditions the effect of the gearing change could go either way... and it's a small change in gearing. Gearing selection is always a compromise.

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Originally Posted by Paul S. View Post
When I need new tires I will likely go with a 35" tire which is larger than the stock 33.5" and I fully expect to use more fuel. I haven't met anyone who hasn't had a drop in fuel economy because of an increase in tire size. The vehicle will sit higher, the tire will probably be heavier...
Yes, but the weight increase of reasonable tires is irrelevant compared to the vehicle weight.
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Old 06-19-2014, 02:58 PM   #57
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A "reasonable" tire? In a truck tire it's hardly irrelevant.
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Old 06-19-2014, 06:07 PM   #58
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A "reasonable" tire? In a truck tire it's hardly irrelevant.
Maybe my intent wasn'tclear in this:
Quote:
Originally Posted by Brian B-P View Post
Yes, but the weight increase of reasonable tires is irrelevant compared to the vehicle weight.
By "reasonable" variations in tires I meant approximately anything available as a factory option, or aftermarket swaps that you might not notice passing you on the street.

Beyond reasonable is stuff that looks like it belongs on an unlimited off-road competition truck. You can mount those things, just as you can swap in a monster engine or military truck axles... and in any of those cases you're probably not posting here and asking if your 12 mpg seems reasonable to other people.

Even a couple hundred pounds of extra tires (for the set of four) is just like another big passenger, and not a big deal for a truck weighing 2 or 3 tons.
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Old 06-19-2014, 07:47 PM   #59
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You're right.

You win.
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Old 06-19-2014, 08:19 PM   #60
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When I said 12 mpg was unacceptable to me, my thought was this:
Fuel prices are forecasted to rise due to the unrest in middle east. Big oil will use this as an excuse to take fuel prices to the next ceiling. I am going to do everything in my power to continue making month long road trips of destinations on our bucket list. Further more I am not going to go any bigger, faster, or heavier to effect my 21 mpg towing average. As I look around this campground tonight, other than a few tents, everyone is camping in giant rv's with slide outs I could park in. My thinking is not the norm. I read something this week that many campgrounds are being remodeled for larger pull thru's, E/W/S, and wifi to accommodate the ever growing average size of todays RV and the extra toys or vehicles they drag behind.
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