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Old 04-15-2012, 10:36 AM   #29
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Originally Posted by kasha 10 View Post
'I have a 2011 Ram 1500 with 5.7 HEMI V8. I get around town about 15 MPG and on the road close to 18 MPG. If I put a 7,600 pound TT on the back what can I expect for MPG -- 8?' Know it depends on if I'm on flat ground or mountains, and how I personally drive, but maybe a 'ballpark' figure? Of course, I don't think this will stop us from RV'ing!!

2WD: 14/20 per EPA.
15/18 per owner

9.6 to 10.2 given a reasonable speed, planning and applied skill on the flats.

8-mpg overall, otherwise depending mainly on terrain. 49-cpm/fuel is one high cost, though (double my cost with a 34' weighing the same).

The difference between 8-mpg and 10-mpg is about $100/fuel at current $3.90/gl over 1,000-miles.

TT weight doesn't mean much except when moving from a dead stop (or on long grades). Aerodynamic resistance is where the money is. Horsepower demand doubles from 55 to 70 mph, and the choice of travel speed will have the biggest impact.

Take your time on setting up hitch rigging, etc. The mechanical baseline of both vehicles (alignment, brake drag, tire pressure) all weigh in every mile traveled.

Get a ScanGauge - Trip Computer + Digitial Gauges + ScanTools as driver & truck will do a better job on power versus economy choices.

Economy is better understood when one calculates the number of nights of use over a given number of years and applies a "miles-travelled" estimate to it. The per-night expense of all inclusive costs. For some it is $100/night, for others well past $300/night. Fuel doesn't hurt so much as an expense once the rest is factored and understood.

.
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Old 04-15-2012, 02:38 PM   #30
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Picked up our new tt last week from about 2-1/2 hours away. Same Aerolite brand (hybrid) but a foot longer and 400 lbs heavier. It's also 7" taller. I was only averaging 9.5 MPG....The problem was being 7" taller I get more wind drag, now my tranny will not stay in over-drive...So instead of 1800 rpm at 59 mph. I'm running in the 2300-2400 rpm range....
The above post was from the day after picking up my new RV from a dealer 2-1/2 hours away. So we spent the last 2 weeks loading the tt up. I was still bummed about only getting 9-9.5 mpg...where my old hybrid I could get 11-12.5 mpg. Just before leaving this past Thursday for a shake-down trip my DW thought the tire on the tt looked low on the one side...I said the dealer said the trailer tires were filled with nitrogen, so I thought the dealer would have made sure they were are the right PSI. I checked them and low and behold. Both tires on one side were at 40 PSI and the two on the other side were at 55 PSI ?????? I have to stop assuming....So I re-adjusted them to 45 PSI. So I'm hoping maybe this will help in the fuel mileage. Our trip was about 50 miles away on about 5 miles city and 45 hy-way..low and behold I got 11-1/4 mpg going and 12.4 MPG on the return trip...And, this is the puzzling part, it was easier to stay in over-drive than my old tt. The new one is a foot longer, 7" taller and 400 lbs heavier...
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Old 04-15-2012, 03:15 PM   #31
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The above post was from the day after picking up my new RV from a dealer 2-1/2 hours away. So we spent the last 2 weeks loading the tt up. I was still bummed about only getting 9-9.5 mpg...where my old hybrid I could get 11-12.5 mpg. Just before leaving this past Thursday for a shake-down trip my DW thought the tire on the tt looked low on the one side...I said the dealer said the trailer tires were filled with nitrogen, so I thought the dealer would have made sure they were are the right PSI. I checked them and low and behold. Both tires on one side were at 40 PSI and the two on the other side were at 55 PSI ?????? I have to stop assuming....So I re-adjusted them to 45 PSI. So I'm hoping maybe this will help in the fuel mileage. Our trip was about 50 miles away on about 5 miles city and 45 hy-way..low and behold I got 11-1/4 mpg going and 12.4 MPG on the return trip...And, this is the puzzling part, it was easier to stay in over-drive than my old tt. The new one is a foot longer, 7" taller and 400 lbs heavier...
Jim
If you did in fact reduce the tire pressure, it should pull harder not better. You need to find the label on the outside of your TT that tells the tire size, PSI etc and use that pressure as a min. 45PSI sounds like a low number, but check it out to be sure.
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Old 04-16-2012, 03:07 PM   #32
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Jim
If you did in fact reduce the tire pressure, it should pull harder not better. You need to find the label on the outside of your TT that tells the tire size, PSI etc and use that pressure as a min. 45PSI sounds like a low number, but check it out to be sure.
Just what I was thinking. I am running 50 to 55 on my rig.
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Old 04-16-2012, 11:09 PM   #33
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Ralphie,

My dad told me a long time ago there is no such thing as a tailwind when in an RV...
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Old 04-18-2012, 08:00 PM   #34
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Old 04-18-2012, 11:31 PM   #35
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I have a 2010 Ram 3500 quad, 4x4, dually, diesel towing a 38' 5er, triaxle, 4 slides, over 13,000lbs at 60-65mph I get 8-9mpg and at 50-55 10-12mpg

I can also say my dodge blows away my traded in F350 same format truck. I was always a die hard Ford Truck, but with this inline 6 Cummins in this Dodge I won't be going back anytime soon
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Old 04-20-2012, 10:19 PM   #36
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Trip to Myrtle Beach this week, 225 miles from home and hand calculated mileage at 10.5 MPG at 65 MPH most of the way. This is a 2012 Ram 3500 Crew Cab Laramie 4x4 pulling a 39 ft Alpine 5er that is scaling at about 13K. This should get better as the truck only had 3600 miles on it when we pulled out from home, and i was carrying more tools than usual as this is the first trip in this camper as well.. Everything has worked out well this week.
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Old 04-27-2012, 01:16 PM   #37
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2008 Ram 6.7 4x4 AT 373 gears, towing 2010 29 ft Cougar TT wt roughly 8500lbs, on a 500 mi trip in Oregon overal average 11. + and I keep my speed below 65mph.
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Old 04-29-2012, 04:52 AM   #38
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We too have a 2011 Ram with the same Hemi. We get about 21 on the highway unloaded. We just picked up a 2012 Denali with a dry weight of about 7,300 lbs. On our first and only trip so far we got 8 to 9 mph. I hoped for better, but oh well it will not keep us from hitting the road.
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Old 05-05-2012, 08:59 PM   #39
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GMC Duramax with 9,000# 11.5 - 12. With 13,000# 11.5 -12. That's a 60-62 mph
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Old 05-05-2012, 09:11 PM   #40
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Question here?

Quote:
Jim
If you did in fact reduce the tire pressure, it should pull harder not better. You need to find the label on the outside of your TT that tells the tire size, PSI etc and use that pressure as a min. 45PSI sounds like a low number, but check it out to be sure.
As stated above I assumed the dealer would have made sure the tire pressure was correct when I picked up my new 2013 25' hybrid tt April 1st. Low and behold one side the two tire were 40 PSI the other side was 55 PSI. So I made all 4 tires 45 PSI, which increased my MPG from 9-9.5 to the 12 MPG range. If the tire max is 50 PSI should I be putting in 50?
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Old 05-05-2012, 10:08 PM   #41
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Question here?



As stated above I assumed the dealer would have made sure the tire pressure was correct when I picked up my new 2013 25' hybrid tt April 1st. Low and behold one side the two tire were 40 PSI the other side was 55 PSI. So I made all 4 tires 45 PSI, which increased my MPG from 9-9.5 to the 12 MPG range. If the tire max is 50 PSI should I be putting in 50?
You have smaller/lighter tires than what I was thinking. As I suggested before, there should be a plate etc either on the out side or maybe in a cabinet inside that has a recomended pressure. Another method is to weigh the loaded TT and use the tire manufacture's pressure chart. Max pressure is OK and may pull a little better.
quote: And, this is the puzzling part, it was easier to stay in over-drive than my old tt. The new one is a foot longer, 7" taller and 400 lbs heavier. Quote:
Was your previous TT taller and/or more blunt than your presant TT? That could make them pull different.
I just noticed that you said the new one is 7" taller. So much for that.
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Old 05-05-2012, 10:50 PM   #42
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You have smaller/lighter tires than what I was thinking. As I suggested before, there should be a plate etc either on the out side or maybe in a cabinet inside that has a recomended pressure. Another method is to weigh the loaded TT and use the tire manufacture's pressure chart.
Printed on the tires it says the max tire pressure is 50 PSI. My next trip I'm going to try going up to 48 PSI like my old trailer.

Quote:
Was your previous TT taller and/or more blunt than your presant TT? That could make them pull different.
I just noticed that you said the new one is 7" taller. So much for that.
NO, they are the same profile, and the same brand and model. Our 05' Aerolite hybrid held up so well we bought the 2013' Aerolite hybrid when a new floorplan came out we liked. Now we didn't have the DW hitch on the old hybrid, and it did sag a bit. The new one because of the heavier hitch weight I went with the WD hitch. Now that was only one 110 mile round trip where I got 12 MPG...
The most puzzling part is that it stays in over-drive a good deal of the time. On the 05' you had to be on a level hi-way with little headwinds. Fact the RPM's are about 150 lower...now ??? real strange.....being level might be the trick, also there is a rounded piece of trim along the bottom of the tt that might help with aerodynamics too.
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