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post #1 of 11 (permalink) Old 10-02-2008, 01:54 PM Thread Starter
 
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Confusing kms to empty

Someone explain why my '08 F150's on board computer indicates 750 kms to empty after a fill up here in Canada, but when I fill up in the USA, the computer indicates 850 kms to empty. All locations that were used are about the same altitude above sea level and were within a few degrees of being the same temperature.
The only other variable would be fuel density which should be identical since it should all be refined the same for any given octane.
Any thoughts?

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post #2 of 11 (permalink) Old 10-02-2008, 09:28 PM
 
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Maybe the american pumps don't stop until your are full right to the top. Vs Canadian pumps stop at a certain lower volume??
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post #3 of 11 (permalink) Old 10-02-2008, 10:25 PM
 
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just remember it is a guesstimate at best. All depends on driving style



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post #4 of 11 (permalink) Old 10-03-2008, 12:49 AM
 
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wow thats a big difference. I know when I fill up and the pump handle makes that first shutoff click, I can get about another $10-15 worth of gas into the tank if I keep going until the filler neck is topped off. Most I ever put in the tank was 94L and its a 96L tank.


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post #5 of 11 (permalink) Old 10-03-2008, 02:07 AM
 
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yeah its possible that the pump is slower and allows more fuel in before it shuts off
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post #6 of 11 (permalink) Old 10-03-2008, 08:17 AM Thread Starter
 
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Thanks guys, I have thought of all those variables, I fill the truck to max volume every time so the quantity of fuel should be very close to equal. I'm going to reset the computer today and see if it calculates anything different. During my summer holiday trip in the US, after each fill up, the computer always showed at least 850 kms to empty which is about 100 kms more than my fill ups in Canada.
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post #7 of 11 (permalink) Old 10-03-2008, 12:57 PM
 
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anything like changing your tire size, programming, this that or the other thing will mess the on board computer up good. The one in my SD is way off


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post #8 of 11 (permalink) Old 10-03-2008, 01:05 PM Thread Starter
 
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Quote:
Originally Posted by BMac View Post
anything like changing your tire size, programming, this that or the other thing will mess the on board computer up good. The one in my SD is way off
Nothing has changed since I installed my Gryphon programmer. I noticed the difference in 'kms to go' when I drove down to the US this summer. The truck has stock wheels/tires.
I'm heading to the US next weekend, I'll fill up down there and see if I still get the discrepancy.

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post #9 of 11 (permalink) Old 10-03-2008, 01:55 PM
 
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Maybe you drive a little slower (different speed limits) when you're in the US and your computer is picking up on that and showing higher efficiency numbers for it.....?

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post #10 of 11 (permalink) Old 10-03-2008, 06:04 PM
 
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It has to do with altitude and barometer and temps, it must be a far bit lower in elevation where you are filling up in the states, because vehicles dont calculate fuel density.
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