Free MPGs, sort of
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Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
Free MPGs, sort of
I had recalibrated my speedometer a while back and though it was reading accurately. I recently bought a GPS navigation system and found the speedometer was showing 'higher' that my actual speed on the GPS. By calibrating it to correct speed, I will gain a little more on my odometer reading and therefore raise my MPG's. I thought I was doing pretty good MPG wise, but now I feel a little more better about it. I had discussed this with Chris (F350-6) and wanted to share the info.
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Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
I'm running 285's.
I used the tire height spec from a website to enter in the calibration formula, but found the actual size was different. This was affecting the speedometer recalibration and causing it to show to more that my actual speed. I used a Hypertech Speedometer Calibrator before I got the AE.
I used the tire height spec from a website to enter in the calibration formula, but found the actual size was different. This was affecting the speedometer recalibration and causing it to show to more that my actual speed. I used a Hypertech Speedometer Calibrator before I got the AE.
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Joined: Feb 2007
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From: Dallas-Ft. Worth
Yep -- mine is reads fast as well. But wouldn't that show MORE miles on the same amount of fuel? If you set it so it shows a slower speed, you'll be covering fewer miles, at least on the odometer, so you'll actually get fewer MPGs. Or do I have this back-asswards somehow? 
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
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From: Grand Lake, La.
Roland, bring your GPS with you. lol. We can check mine. I could use more MPG. Congrats on the recal.
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Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Yep -- mine is reads fast as well. But wouldn't that show MORE miles on the same amount of fuel? If you set it so it shows a slower speed, you'll be covering fewer miles, at least on the odometer, so you'll actually get fewer MPGs. Or do I have this back-asswards somehow?
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Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
I get more confused the more I try to think about this. I may have shot myself in the foot with my statement. 
I do know that I have I it reading correctly now and it seems like I have traveled more miles, by my fuel gauge, than I usually get since I filled up a couple of days ago. I played with the tire size to finally get it to read right. I went both ways and rechecked the speed.
Oh well, at least I know that it's right now.
the more I try to think about this. I may have shot myself in the foot with my statement. I do know that I have I it reading correctly now and it seems like I have traveled more miles, by my fuel gauge, than I usually get since I filled up a couple of days ago. I played with the tire size to finally get it to read right. I went both ways and rechecked the speed.Oh well, at least I know that it's right now.
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Joined: Jan 2009
Posts: 2,544
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From: Suffolk, VA
Yes, it is backwards from what you originally thought. If your speedo is reading high, then the odometer shows you are traveling farther than you really are. So you're mileage will actually not be as good as you thought. Doh! Can you go back and forget what you've found?
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Lead Driver
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From: Damon (South East Texas)
Files deleted in my memory banks. It sounded good anyway.
Postmaster
Joined: Jan 2009
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From: Suffolk, VA
When I first bought my truck it had 35s on it. I was thinking the same thing about the mileage, that it was better than I was getting. When I put the shorter 285s on there, I realized I had it backwards. Don't really care anymore now, I just fill it up when it's empty. It is what it is. I did an experiment last weekend and calculated the mileage, but it's rare I do that.
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Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
When I first bought my truck it had 35s on it. I was thinking the same thing about the mileage, that it was better than I was getting. When I put the shorter 285s on there, I realized I had it backwards. Don't really care anymore now, I just fill it up when it's empty. It is what it is. I did an experiment last weekend and calculated the mileage, but it's rare I do that.
