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Old 05-12-2011, 10:28 AM   #21
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Originally Posted by aftermath View Post
I have to agree with Zig. The speedometer and odometer use the same mechanism to compute revolutions of the tire. Mess with the tire size and you will throw both off. I can't see where you can have a speedometer that is wrong but an odometer that is correct.

FWIW, I drive a Tundra with a 5.7 and get between 11 and 12 towing. For me it really makes a difference on the big hills and high winds. Just got back from a 2 hour drive in stiff head winds where I averaged 8 mpg. That wasn't a lot of fun. A few days later the winds switched around and I drove home with a consistent side wind. Got 10.8 then.

I do get 17 on the highway unloaded. If I were pulling a shorter and lighter trailer I could imagine 13 or so.
IF both are accurate to begin with, they'll see the same sort of aberration if you change tire size or rear axle ratio. However, while they're both counting revolutions, they're doing so in a different way. The speedo deflects the needle proportionally based on revolutions per unit time, the odo just counts the revolutions and isn't concerned with time.
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Old 05-12-2011, 10:44 AM   #22
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Actually, concerning modern computerized vehicles, the computer runs both the odometer and the speedometer. However, the odometer is sort of a digital counter, where the speedometer is actually a milliameter.

That given, the odometer is more likely to be correct.
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Old 05-12-2011, 11:35 AM   #23
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Can these modern speedometers be calibrated?

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Old 05-12-2011, 06:29 PM   #24
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Yes*

*car and mfr dependant but yes in Subaru and Honda
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Old 05-13-2011, 11:18 PM   #25
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2003 BMW X5, V6, 95000 miles. 18 city/20 hiway. Towed our 19' from VA to FL (WDW) and back at 65 MPH, and got 13 MPG. That is our overall average when towing on east coast.
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Old 05-16-2011, 11:45 PM   #26
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Just got back from three great nights at Morro Bay State Park. As expected, on our round trip from LA we averaged 10.5 MPG. Not as good as our last two trips to San Mateo SP by Camp Pendleton, but lots more hills.
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Old 05-17-2011, 07:59 AM   #27
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We didn't calculate mileage on our recent trip, but we're pretty sure that we did pretty well. This trip, however, we intentionally took the foot off the throttle whenever we could, allowing the transmission to select as high as possible in all cases. On lonely state highways, by climbing hills at very low speed rather than at full speed, it just doesn't make much difference to the flow of traffic (since there was none).

It was quite a shock to have to get on the interstate for one stretch. Not very fun at all.


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Old 05-17-2011, 04:41 PM   #28
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I have gotten 11-13 MPG on regular towing a 31' 1980 with a V10 Ford. I get a little better now that I tow a 66 AS. I don't drive faster than 60 when towing.

According to Consumer Reports and the EPA, the Fuel Doctor should be renamed the Fool Dr.
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Old 05-17-2011, 05:00 PM   #29
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7 mpg pulling the Feathercraft

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Old 05-17-2011, 05:04 PM   #30
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With my 2007 Lexus GX470 pulling 2007 20' safari, I get an average of 11 mpg going through some mountain.
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Old 05-17-2011, 06:18 PM   #31
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I just got a brand new 2011 Ford Larit F-150 with the Turbo Eco Boost engine. My research says 22MPG without towing. I have a 22' CCD International and will be going out at the end of the month. I'm curious to see what kind of milage this will bring. I sure hope it surpasses my expectations because I love this big silver truck.. :-)
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Old 05-17-2011, 07:10 PM   #32
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We just completed our first long trip with our TV/AS combo. We traveled 13 days and 2200 miles on a round trip from our home in New Jersey down through Maryland, West Virginia, and Virgina to Crossville, Lynchburg and Nashville, Tennesssee. Our '06 Silverado 2500 Duramax/Allison averaged about 14.7 mpg pulling our '09 23' Flying Cloud. Some tanks were better and some worse, depending on terrain, including some 7% grades in WV. I usually cruise at about 63mph, when I can, with the tach showing about 1700-1800 rpms. I was real pleased with that and I can't say enough about the way the diesel performed! The only way to go IMHO, but that's the topic for another thread!
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Old 05-23-2011, 09:15 PM   #33
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I tow a 27' Flying Cloud with a 2011 Ford F-350 4x4 diesel - 14 mpg.
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Old 05-24-2011, 10:09 PM   #34
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I tow a 23' International w/ a 2010 Ford f150 fx4 with max tow and max payload packages ( rated to tow 11300lbs.) and from NEPA to Savannah, GA and back on I-81 we got between 12 & 13 mpg. On the interstate to Canada w/out towing, I got 19.9mpg (13 hours) - at the cost of regular gas. I went in to buy the 2011 f250 diesel - a great vehicle - but it wouldn't have done a better job -IMHO- and cost less to buy and less to fuel. I also often drive the F150 on a daily basis. The F250 is a great truck, but in the Pocono Mts., diesel is much more expensive than reg. Gas.
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Old 05-24-2011, 10:27 PM   #35
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Just did 350 miles outward with 12.5 mpg (US) and the return at 10.5 mpg (US) - the head wind was nasty on the way back. Maintained 62mph as far as possible on the highway. It was mostly quite flat.

That was our 2011 Toyota Sienna towing a 2011 28' International Serenity.

Of course, it's a little better when not towing!
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Old 05-24-2011, 10:43 PM   #36
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That's not bad! I'd love to see the 28' Serenity. We have the 23' and love it. I usually tow at 65 - 70 mph and feel very comfortable. I wish I could get away, but rain, high water and work have conspired against me this Spring! Sooner or later

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Old 05-31-2011, 10:53 PM   #37
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It's early days yet but on a horribly windy day coming back from Upstate New York, our 2011 Toyota Sienna recorded a miserable 10.4 mpg (US) over the 350 mile trip. That was towing our 2011 International Serenity, with the kids on board.

Last weekend we did a little over 100 miles coming home from Goderich in Ontario and clocked 15.8 mpg (US), although that was without kids, no wind and no highway work. I reckon we'll average around 12 mpg (US), maybe a bit better as I get the hang of driving sensibly, by the end of the season.
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Old 05-31-2011, 10:54 PM   #38
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Oops! Just realised that I'd already posted in this thread. Doh!
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Old 05-31-2011, 10:56 PM   #39
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That's not bad! I'd love to see the 28' Serenity. We have the 23' and love it. I usually tow at 65 - 70 mph and feel very comfortable. I wish I could get away, but rain, high water and work have conspired against me this Spring! Sooner or later

Happy travels,
Peter
In Canada, the speed limit is 62mph and I like to stick to that; I'm the only one in the whole country who does, though.

The 28' Serenity is brilliant, I'm glad we went for it, despite the cost and the weight.
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Old 06-01-2011, 04:59 PM   #40
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On our 7,000 mile trip from Utah-Florida-Idaho, I averaged 8.4 mpg with our 2008 F-250 V-10 towing our 2002 30' Classic w/so. Considering the head winds, mountains, stop/go in big cities, I thought it was great. I did not use the "lie-o-meter", it was actual mileage/gallons used at each fill-up.

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