Fuel mileage question, seems strange.
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Junior Member
Joined: Jul 2005
Posts: 7
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From: Lakeland, Fl
Who's "worrying" about fuel mileage, I was just making an observation. Did you just climb out of a hole or something?
Senior Member
Joined: Mar 2005
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From: Texas in the heart
I drive my 09 Platinum 100 miles a day (mostly) on the autobahn here in Germany. I'd venture that you were going down hill with a tail wind to get that high over 80. I've driven mine for my commute at all speeds and found:
60-65 @ 20.1
70-75 @ 19.4
80-85 @ 18.2
90+ @ 17.0
P.S. I run Royal Purple motor oil and a K&N Drop in Air Filter. It DOES make a difference
60-65 @ 20.1
70-75 @ 19.4
80-85 @ 18.2
90+ @ 17.0
P.S. I run Royal Purple motor oil and a K&N Drop in Air Filter. It DOES make a difference
Senior Member
Joined: Oct 2009
Posts: 294
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From: Iowa
We just had the nasty low pressure system roll through Iowa the past two days. Going to Des Moines, with a 30mph sustained tail wind, I got 22.3 mph driving at 70mph. Coming back, I got 12.6mpg on the same road (which is pretty darn flat). On level ground the truck kept downshifting to push the headwind.
Wind plays a HUGE part in mileage for these trucks. I haven't been able to noticeably alter fuel economy with filter or fluid changes in my 65k of highway driving.
BTW we just switched to winter blend fuels in Iowa, because my mileage dropped 1.5 almost overnight and is now locked in at about 16.5mpg per tank of highway driving.
IowaAndy
Wind plays a HUGE part in mileage for these trucks. I haven't been able to noticeably alter fuel economy with filter or fluid changes in my 65k of highway driving.
BTW we just switched to winter blend fuels in Iowa, because my mileage dropped 1.5 almost overnight and is now locked in at about 16.5mpg per tank of highway driving.
IowaAndy
Senior Member
Joined: Jul 2001
Posts: 1,828
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From: Home of Crown Royal
RP "made my car run worse than before" ? Did you put it in the gas tank? WOW full syntetic oil made it run worse? What kind of car?
Senior Member
Joined: Sep 2010
Posts: 297
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We just had the nasty low pressure system roll through Iowa the past two days. Going to Des Moines, with a 30mph sustained tail wind, I got 22.3 mph driving at 70mph. Coming back, I got 12.6mpg on the same road (which is pretty darn flat). On level ground the truck kept downshifting to push the headwind.
Wind plays a HUGE part in mileage for these trucks. I haven't been able to noticeably alter fuel economy with filter or fluid changes in my 65k of highway driving.
BTW we just switched to winter blend fuels in Iowa, because my mileage dropped 1.5 almost overnight and is now locked in at about 16.5mpg per tank of highway driving.
IowaAndy
Wind plays a HUGE part in mileage for these trucks. I haven't been able to noticeably alter fuel economy with filter or fluid changes in my 65k of highway driving.
BTW we just switched to winter blend fuels in Iowa, because my mileage dropped 1.5 almost overnight and is now locked in at about 16.5mpg per tank of highway driving.
IowaAndy
I got rid of my windshield wipers and the reduced drag gained me 3 mpg.
Member
Joined: Sep 2009
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I go to UCSD so I have driven many times from L.A. to S.D. and back.
I have cruised at 74mph the entire way and have gotten 20mpg flat.
I have also cruised at 80mph the entire way and have gotten 22.5mpg flat.
I am thinking that temperature can make a big difference. I have gotten 19mpg before also at 74mph
Last week I cruised at 65mph the last 44 miles and got 25.5mpg
I have cruised at 74mph the entire way and have gotten 20mpg flat.
I have also cruised at 80mph the entire way and have gotten 22.5mpg flat.
I am thinking that temperature can make a big difference. I have gotten 19mpg before also at 74mph
Last week I cruised at 65mph the last 44 miles and got 25.5mpg
Senior Member
Joined: Dec 2006
Posts: 43,542
Likes: 819
From: Joplin MO
I find that hard to believe on California goatpiss gas, Brute. If you are basing this on the lie-o-meter, are you confirming it with actual gallons/miles math? If it confirms, you are very lucky. What model is the truck, what engine, tranny, and axle ratio?
Senior Member
Joined: Jul 2010
Posts: 429
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From: Upstate New York
EDIT: Please strike my last comment from the record. Google helped me understand. Wow, I just never knew that.
Last edited by juneau76; Nov 1, 2010 at 07:22 AM.