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Speed Vs. MPG

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Old 11-22-2011, 06:05 PM
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Screw 6.5 3.73

65 -19.8
70 - 18.8

No cross wind.
Old 11-22-2011, 06:06 PM
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Originally Posted by TexomaRazorback
Screw 6.5 3.73

65 -19.8
70 - 18.8

No cross wind.
4x4
Old 11-22-2011, 10:14 PM
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Originally Posted by TexomaRazorback
Screw 6.5 3.73

65 -19.8
70 - 18.8

No cross wind.
6.5?
Old 11-22-2011, 10:53 PM
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After seeing mikes numbers and with hardly ever towing I almost wish I had the 3.15's.
Old 11-22-2011, 11:35 PM
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Originally Posted by justjimmy
6.5?
6.5 foot bed
Old 11-23-2011, 12:01 AM
  #26  
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XLT
Scab 6.5
3.5L
4x4
3.73

55: 29mpg
60: 25mpg
65: 21mpg
70: 20mpg
Old 11-23-2011, 07:36 PM
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2011 Ford F-150 XL
6.5' bed
4X2
5.0 L V8
3.73 rears
Tuner: SCT
Gas: 91

90 KM/H (56 mph) 25.7 MPG
100 KM/H (62.15 mph) 23.5 MPG
105 KM/H (65 mph) 20.8 MPG
110 KM/H (68 mph) 20.1 MPG

The MPG numbers were taken from the computer, after I changed the 'units' from 'Metric' to 'US'. I spent 10 MILES at each given speed. Cruise control was used 100% of the time.

Just as I suspected, 100 KM/H was the best speed because my RPMs were at roughly 1,750 which I think is a sweet spot for the truck.

Here's the video report
Old 11-24-2011, 04:02 PM
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Did the same test with a Hypertech tuner and 93 gas, and gas mileage went down by at least 2 MPG.
Old 11-24-2011, 05:00 PM
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Can someone please tell me what the point of this thread is? There's a lot of data here, but aside from showing that slower driving equals better mpg, what good is all the info if nobody is tabulating and analyzing it.

I don't mean to be rude in any way, I just don't get it.
Old 11-24-2011, 10:41 PM
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The point is that either some EB owners are inflating their numbers for whatever reason or ford needs to address the huge difference in mileage. Seriously, how can a truck with 3.73 gearing get 1-2 mpg better at 70 than a truck with 3.55.


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