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Old 03-29-2012, 06:08 PM   #1
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,572
VMSpc Engine Corrections for ISL

For those that run the VMSpc program from SliverLeaf, I have been adjusting the "Engine Corrections" to get my fuel mileage to work out correctly. When you first set up the program, you have to guesstimate you're average mileage over the life of the coach to get the parmeters set correctly. I've been playing with the parameters on the fuel consumption side so that my average mpg would be as accurate as possible.

I'm now at the point that when I fuel up, I'm within a gallon or so (about 5%) of what the computer says vs what I actually take. I've been doing this over the last several trips, trying to level the coach each time I fuel. If you don't get this correction (made in the Advanced settings) close, your mpg will be way off.

In the tool bar at the top of the screen there is a drop down menu called "Advanced".

Under "Advanced" is a tab called "Engine Corrections".

If you open "Engine Corrections", there is a window for "Fuelmeter". I believe its originally set at 1.0 After playing with mine, I found 1.0743 got me about as close as I can to what the adjustment should be.

****Note....When you change the number from 1.0 to the new number, your lifetime fuel mileage and gallons used will adjust downward on the mpg and upwards on the gallons used.

In that same window is the correction for the odometer. I felt my OEM odometer was pretty accurate, but it didn't match the VMSpc odometer. They recommend adjusting this when you get the program. I adjusted the odometer from 1.0 to 0.9415. This brought the VMSpc odometer to within 5/10's of a mile difference between the two.

I know not all the engines are the same or run the same, but I thought this my help the ISL owners get close to what is correct. I hope my explanation isn't too convoluted.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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Old 04-01-2012, 07:26 AM   #2
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Monaco Owners Club
Join Date: Nov 2010
Location: The Emerald Coast
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Thank you for pointing this out. I have just set mine up and noticed the mileage difference. Lots of stuff to futz with.
Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
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