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Old July 21st, 2011, 06:19 PM   #1
sQUEAK003
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It amazes me at how much doing 85mph vs 65mph affects your gas mileage. I have been sticking to 65 on the e-way and yesterday was running late for work. I did 85 for 36.1 miles. I dropped 1 mpg this tank just from that trip.

Does anyone else use a program to track fuel mileage?
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Old July 21st, 2011, 06:33 PM   #2
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for my wife's WJ with a 4.0
MPH MPG
60 24.6
65 23.6
70 21.8
75 20.4
80 18.1

Which means about 33% more fuel used at 80 compared to 60, or roughly 1.30 more per gallon.
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Old July 21st, 2011, 08:12 PM   #3
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My car seems to perform best at ~78 MPH. I get close to 40 mpg at almost 80 MPH. I set the cruise daily at track every tank. I have tried setting it at 65-70 and it isnt as good.
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Old July 21st, 2011, 08:17 PM   #4
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Aero drag is exponential (Speed^2). No secret.
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Old July 21st, 2011, 08:26 PM   #5
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A couple years ago we tried all the Hypermilage things. It helped a bit. Keep it under 2K, drive 65, etc. I then decided I liked to drive faster. So i did.
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Old July 21st, 2011, 08:27 PM   #6
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I then decided I liked to drive faster. So i did.
I tried setting the cruise at just under 70 for a few days. It takes forever to get anywhere.
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Old July 21st, 2011, 08:28 PM   #7
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If I keep my truck under 2k it gets not horrid mpg.
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Old July 25th, 2011, 01:30 PM   #8
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Quote:
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I tried setting the cruise at just under 70 for a few days. It takes forever to get anywhere.
it takes me 3 min longer to get to work doing 65 than 70.
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Old July 25th, 2011, 01:38 PM   #9
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My car seems to perform best at ~78 MPH. I get close to 40 mpg at almost 80 MPH. I set the cruise daily at track every tank. I have tried setting it at 65-70 and it isnt as good.
That is the way my GTP as.. Got better gas mileage with the cruise set at 83/84ish than it did at 70
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