Truck mpg vs "hand calc" mpg - Ford Powerstroke Diesel Forum
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Old 09-09-2013, 05:34 PM
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Truck mpg vs "hand calc" mpg

Just wondering what procedure you use?
I am always seeing folks fussing about the "Truck" lying and how much better the hand calc is. So, how do you do it?
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Old 09-09-2013, 05:40 PM
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Miles driven divided by gallons to fill.
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Old 09-09-2013, 05:41 PM
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Fill up your tank.
Drive a distance (you choose).
Fill up your tank. Observe how many gallons it takes to fill up.
Divide the miles you drove by the gallons you filled up with.

Example: You drive 200 miles and you put in 10 gallons.
200 divided by 10 equals 20 mile per gallon.
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Old 09-09-2013, 05:43 PM
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My computer is usually reading 1mpg higher than what I calculate.
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Old 09-09-2013, 05:47 PM
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Oh, Im not talking about the math. That is simple. What I'm getting at is how do you know that your hand calc is correct? If your going off of the trip or odometer how do you know that the calibration is correct? How do you know if you put in fuel to the exact same level the second trip to the pump?
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Old 09-09-2013, 05:55 PM
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A couple of different ways to check the trip meter.

1. GPS unit - Probably the most accurate.
2. Find a highway that has mile markers on it.

Fuel fill up.
1. You could fill to till the pump clicks off the first time. Drive your distance, but make it possible to come back to the same pump and do the same thing.
2. Fill your truck until the fuel is at the top of the filler neck, drive around and fill it up the same way.
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Old 09-09-2013, 06:14 PM
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Thanks, I agree. The GPS can also be used to verify your speedo and if that is correct then your trip and odometer will be as well. Most OEM GPS units will however use a speed input from the vehicle and throw your calcs off that way. A stand alone GPS would be a good idea. Another thing to remember is to fill up at the same time of day and fill slowly to avoid foam up and vapor expansion.
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Old 09-09-2013, 07:00 PM
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Quote:
Originally Posted by Traxx View Post
Thanks, I agree. The GPS can also be used to verify your speedo and if that is correct then your trip and odometer will be as well. Most OEM GPS units will however use a speed input from the vehicle and throw your calcs off that way. A stand alone GPS would be a good idea. Another thing to remember is to fill up at the same time of day and fill slowly to avoid foam up and vapor expansion.
I'm not totally convinced that the speedometer and odometer are perfectly synced. My speedo reads 1mph slow going off my GPS at 55mph, but when Im watching mile markers, I'm off by over a tenth in a mile.
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Old 09-09-2013, 07:19 PM
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I have a handheld GPS unit and I used it a while back. I had it on my dash for clear satellite view. I reset my trip on my truck and on the GPS and over a 20 mile trip the GPS said 20.3 and the odometer said 20. And my speedometer was 2mph off. GPS said 73, and cruise was set at 75.

Sent from my DROID RAZR
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Old 09-09-2013, 07:25 PM
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Look at it as a percentage. 1 mph is 1.8% or to round up approx 2% at 55. Now 2% is no where near a tenth of a mile but its hard to keep a eye on 2 things at the same time specially with one in the truck and one out side and 10 ft away. Try getting the distance with your GPS as well.
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