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Old 05-12-2011, 06:31 AM   #15
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If the speedo is off by 10 percent is the odo also off by the same. jim
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Old 05-12-2011, 06:47 AM   #16
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We just drove to Gettysburg, PA from Idaho; almost 4,000 miles. Our mpg has varied depending on speed, terrain and weather from 10.5 to 13. Cost of fuel has ranged from $3.31 (Wyoming) to $4.29 (Michigan). In addition to the AS, I've got two generators and some other items in the bed of the pickup under cover. We get 17 mpg w/o the AS. Anything above 11 mpg is better than budget. Having a great time.
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Old 05-12-2011, 07:05 AM   #17
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If the speedo is off by 10 percent is the odo also off by the same. jim
my 94 dakota must be an exception. a few trips between ny and florida the odo matches the gps(s) but the speedo is showing - 4 mph @ 70 mph on the gps. it does seem odd.
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Old 05-12-2011, 09:44 AM   #18
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1999 Dodge Durango 5.2L lightly modded: 14-15 city, 19 highway @ 65mph/16 highway @ 80, 9-11mpg towing @ 65mph. 4600lbs + 4spd + gasoline = low mileage
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Old 05-12-2011, 09:50 AM   #19
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If the speedo is off by 10 percent is the odo also off by the same. jim
This is not necessarily true. Speedos tend to be a little high and odometers are usually pretty close to accurate (with a stock tire size) these days.
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Old 05-12-2011, 10:20 AM   #20
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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.
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Old 05-12-2011, 10:28 AM   #21
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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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