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04-23-2008, 04:15

I do not use mine on a regular basis. I use it on long trips and I used it to verify the accuracy of my coach gauges. I have found that my coach gauges are extremely accurate so I typically rely on them and do not bother plugging up the computer to the DDL. One less things the kids fingers can mess with. They can use the PSP.
My coach runs better fuel economy on average than does Don's. My most recent short trips were in the 5.8 range. Of course most of that is on flat land. Wind, mountains, your gross weight, the cruise speed you decide to use, and other factors cause mileage to vary, including generator usage which the VMSpc cannot measure.
So the mileage is what it is and probably will remain so. I am to the point that I do not get fired up about it any longer because I know I ain't gonna get 6.5. lol

Leroy Eckert
1990 WB-40 Smoke N Mirrors
Dahlonega, GA
Roale Conversion

Don Bradner
wrote:

Over the course of the 7K miles I've put on Blue Thunder so far, VMSpc runs about 5.1 vs 5.3 measured by calculation. So, I always take a bit less fuel than the "Tank Minder" on VMSpc says I will need, which is a good thing!

On 4/23/2008 at 3:38 PM mbulriss wrote:

>Don,
>
>I don't have that fancy VMSpc stuff. I have to do it the old fashion
>way on each fill up, dividing miles by gallons with pencil or
>calculator...... From what I read, I believe that you, Leroy and
>others really like it, and it seems
fairly accurate based on the posts
>I have read.
>
>Just out of curiosity, what has been your experience double-checking
>the VMSpc box on mileage? I know my Jeep GC read-out on mpg isn't
>even close. It's always waaaay optimistic by 3+mpg.
>
>Thanks,
>
>Mike Bulriss
>1991 WB40 "Texas Minivan"
>San Antonio, TX
>
>
>--- In "WanderlodgeForum%40yahoogroups.com", "Don Bradner"
>...> wrote:
>>
>> As a long-time VMSpc user, I do not doubt that the 1 mpg increase
>was seen. The problem is in ascribing a particular cause to the
>phenomenon, sort of like "I have cancer, and I know it was because
>that crop-duster flew too close to my house when I was 10 years old."
>>
>> I routinely see 1 mpg or more difference in trip segments.
Most
>commonly West-to-East is better than East-to-West, because of
>prevailing winds, but also due to wind anomalies and of course
>gradient direction. A good head wind can knock a full mpg off, as a
>tail wind can add an mpg, for a difference of 2.
>>
>> Don Bradner
>> 90 PT40 "Blue Thunder"
>> Eureka, CA
>> Hoping to head up the Oregon Coast tomorrow, and the forecast says I
>will have a small tail wind
>>
>> On 4/23/2008 at 3:06 PM mbulriss wrote:
>>
>> >Using the "I don't believe it until I see it" logic, then there is no
>> >way Kurt got a 1 mpg increase after changing to the synthetic tranny
>> >fluid, repardless of wht his VMSpec says.
>>
>
>
>
>------------------------------------
>
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