8 mpg or less / 29,40 liters or more for 100 km 11 14.86%
9 mpg / 26,14 l for 100 km 6 8.11%
10 mpg / 23,52 l for 100 km 11 14.86%
11 mpg / 21,38 l for 100 km 10 13.51%
12 mpg / 19,60 l for 100 km 18 24.32%
13 mpg / 18,09 l for 100 km 8 10.81%
14 mpg / 16,80 l for 100 km 4 5.41%
15 mpg / 15,29 l for 100 km 4 5.41%
16 mpg / 14,70 l for 100 km 1 1.35%
18 mpg or more / 13,07 liters or less for 100 km 1 1.35%
Voters: 74. You may not vote on this poll

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Old 04-05-2003, 08:17 AM   #15
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1969 31' Sovereign
Broken Arrow , Oklahoma
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I stay in OD unless on a long incline.
There is much controversy on this issue but my truck just seems to do better and run just a tad cooler in OD.
I did blow a transmision by driving to fast in OD with a 30/ 40 MPH head wind pulling a duel axel trailer. I didn't notice the temp creeping up till it was to late. The trailer was a covered utility with a sq. front.


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Old 04-05-2003, 04:39 PM   #16
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2004 25' Safari
. , Illinois
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Today, I just installed a air dam to channel directly through the trans cooler. Built it myself out of roofing alum ice dam material. GM on the B-Body cars has it tucked behind the bumper so there was little to no direct shot for air to hit it.

I've noticed a drop in temp. Before I could not keep my hand on the trans cooler pipe. Now, I can hold on tight, but I do notice that when in park, not moving, engine running, that I can start to feel it heat up.

For less than $5 worth of material and an hour, looks like I found a worthwhile mod. I'll be testing it further this week.



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Old 05-15-2003, 12:28 PM   #17
Very american 4 a french
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1971 27' Overlander
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is really your consumptions soo low with your great trucks towing heavy A/S ???

I'm really surprised;

My small 2 liters FORD 115 cv need 15mpg ...
I 'm afraid when I'll tow my 27' this summer... how many fuel liters ...
Is a fordE150a good choice for me ???

Thank you one more time.

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Old 05-15-2003, 02:28 PM   #18
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2004 30' Classic Slideout
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My mileage is 10 mpg while towing in third gear. I'm pulling with a '99 Chevy passenger van with the 5.7 liter V8. According to the manual I cannot use overdrive when towing. My Safari with food and clothes comes in about 6,000 lbs.

Jack Canavera
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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Old 05-15-2003, 03:05 PM   #19
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My 2003 Ram 1500 with 4.7 gets 9-11 mpg. 12-16 not towing. Could get 18 if I wasn't in a hurry. Maybe someday.
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Old 05-15-2003, 04:47 PM   #20
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1979 31' Sovereign
Fairview , Montana
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Our 1979 GMC 3/4 ton has a 454 with a 3/4 cam. It gets 7 mpg empty, 7 with pu camper, add a 14 foot trailer, its 7. With our AS, its 7. We are effected by head winds, but out here, a 30-40 mile per hour headwind is not unusual, so that you would expect to effect a high profile vehicle.
The Trumpowers
1979 SLY 31'
1979 GMC 4 door with s/c camper shell
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Old 05-15-2003, 06:46 PM   #21
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I talked about this a little on the chat last Tues. I just towed home a 73 31' International that I just purchased with my new (to Me) 2000 F250 Powerstroke Diesel. One the trip down I got-no kidding-19.3 empty!! Pulling the trailer back I got 13!! I was floored. And no I didn't go by the little computer in the overhead. Its stuck on 15.8 regardless for some reason!

I ususally tow my 77 25' Tradewind with a 1/2 ton Suburban and got anywhere between 12 and 14 depending on road conditions and how big of a hurry I was in.

BTW I usually leave the vehicles in OD, but the Suburban I occasionally drove in 3rd through hilly terrain.
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Old 05-16-2003, 07:12 AM   #22
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On a trip from Houston, TX to Little Rock, AR towing our Bambi fully loaded against a 20mph head wind, approx average towing speed of 67-68 mph, we got 11.23mpg with my GMC 5.3 Extended cab pickup 3.73 rear end. On the way home wind had switched but was still against us (approx 15mph) we got 11.58 mpg.
Rod Pease
19' Bambi
2001GMC Z-71 5.3L 3.73
5W-30 Synthetic
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Old 05-16-2003, 09:03 AM   #23
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My '99 Dodge Ram 2500 Diesel gets similer milage to Tripp. I managed to get 20 mpg once along the Corolina coast (empty). However, I usually get around 18-19mpg empty and 13-15mpg loaded.

OH. I drive in "hilly" terain in central Virginia usually. When I hit mountains (such as West Virginia) my milage will drop by about 1mpg.

Patrick Crusse
'74 Tradewind 25', Rear Bath - Center Twin, Mostly Original except wood floors.
Tow Vehicle: '99 Dodge Ram 2500 w/ Cummins Diesel, Auto Trans. Tows great even without equilizer hitch.
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Old 05-16-2003, 06:28 PM   #24
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1977 23' Safari
1976 31' Sovereign
Robbins , California
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Last summer Our family took a 3300 mile trip thru Nevada,Idaho,Wyoming,Montana,Washington,Oregon on mostly rural 2 lane highways. Average MPG for trip was 12.6. The truck is a Diesel 96 F350 4WD crew cab with 4.10 gears and a automatic and a 65 HP performance chip. Trailer is a 77 23' safari. I drove about 63 MPH when conditions permitted and trailer water tanks were always full. Gross vehicle weight was 14,200 pounds. The truck was run hard in the hills and never babied. So that is as real world as I can give you for our particular combo.
Mike B
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Old 05-20-2003, 08:46 AM   #25
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To convert mpg into litres / 100km, divide the number into 283.

To convert the other way, divide the number into 283.

So 12 L/100 becomes: 283/12 = 23.58 mpg

23.58 MPG becomes (283/23.58) = 12L/100
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Old 06-20-2003, 11:48 PM   #26
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1971 27' Overlander
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is there someone able to say me the fuel consumption for my future buy about the

FORD E 150 1996, 4,9 l, 200cv ?

when towing and not.

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Old 02-29-2004, 11:24 AM   #27
Very american 4 a french
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1971 27' Overlander
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Finally, not an E150 but F 150

Finally, I've not found the famous E150 and I've decided to get the F150 model to start again the season.
After equiped it with LPG to reduce cost when driving , my consumption without A/S is 13 mpg.
I'm very impatient to know this consumption with the A/S behind the P/U, but many things to do to equip it fot towing ( hitch receiver, brake controler, wiring ) and try it.
Sure, it'll be OK for this summer;

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Old 02-29-2004, 01:12 PM   #28
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A mechanical engineer once explained to me that the fuel economy from a gasoline (or diesel) engine can be directly calculated using a ratio between the friction (energy exerted by the motor under a given load) and the displacement of the engine multiplied by a coefficient derived from the efficiency of that particular motor. He went on to explain further that although it is not likely that an engine with a larger displacement will ever yield better fuel economy than that of a smaller displacement at any load, the engine with smaller displacement will quickly approach that of the larger engine as these forces increase. The durability and longevity of engine life, however, will be significantly affected as this ratio increases to the point where the smaller displaced engine's lifespan is reduced significantly. Cylinder quantity and arrangement was also factored into this equation.


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