MPG East Coast vs West Coast - Ford Powerstroke Diesel Forum
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post #1 of 24 Old 07-18-2019, 09:45 AM Thread Starter
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MPG East Coast vs West Coast

Alright, so I bought a 2018 F-250 in South Carolina back in May. Uncle Sam tells me to move to the West-ish Coast (AZ) and that's where I'm at currently. In SC, I averaged high 17-18 combined MPG which I was pretty happy with, but here in AZ I'm averaging mid 15's. Granted I've only gone through about two tanks of fuel since we got here, but the truck only has about 3,000 more miles on it and the driving environment is similar between the two locations. Any glaring differences between these two ~sea level locations that might contribute to a 8-13% drop in fuel economy? Is there a difference in diesel fuel coast to coast or can I chalk this up to the higher temps? Thanks.
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post #2 of 24 Old 07-18-2019, 10:22 AM
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Actually, higher temps themselves shouldn't really make that much difference in mileage unless you're talking about going from 30's to 100's. That could contribute to some loss. The A/C running more might contribute more. Elevation could make a difference as well. If you were on the coast in SC and in the mountains in AZ, not only the elevation, but also the additional grades you have to pull could have substantial effect.

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post #3 of 24 Old 07-18-2019, 12:27 PM
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Humidity, poorer quality fuel? Guessing....but high 14's to low 16's is what I get with general driving in Phoenix.
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post #4 of 24 Old 07-18-2019, 12:41 PM
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post #5 of 24 Old 07-18-2019, 07:37 PM Thread Starter
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Voodooridr, I feel for you guys out in CA. I drove through your state for a brief period on our trip across the continent and could not wait to exit to AZ. We took the scenic route through the northern portion of the country stopping over in NC, OH, IA, SD, WY, CO, and NM before getting to AZ. When we drove through CA on the 40 I made it a point to stop for fuel before and after CA because I was not about to pay those ridiculous prices. Those prices equate to legalized extortion.
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post #6 of 24 Old 07-19-2019, 07:40 AM
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Originally Posted by streetbob76407 View Post
Voodooridr, I feel for you guys out in CA. I drove through your state for a brief period on our trip across the continent and could not wait to exit to AZ. We took the scenic route through the northern portion of the country stopping over in NC, OH, IA, SD, WY, CO, and NM before getting to AZ. When we drove through CA on the 40 I made it a point to stop for fuel before and after CA because I was not about to pay those ridiculous prices. Those prices equate to legalized extortion.
As of this past weekend it cost almost 150 dollars at 3.85 a gallon to fill my CCLB. Fun fact, most gas stations max your card swipe at 100 bucks. So you have to swipe again.

I can’t wait until the military moves me out of this crap hole.
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post #7 of 24 Old 07-19-2019, 08:15 AM
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Another thought, is your truck going into regen these past few tanks, possibly due to it not completing one and when at operating temp, starts up again?
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post #8 of 24 Old 07-19-2019, 08:25 AM Thread Starter
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I can't say it's not, but I can usually tell by looking at the current MPG scale when it's in regen by how low it dips on the scale while cruising. And like I mentioned before, the driving environment that I'm in now is similar to that of SC aside from temperature and humidity. Meaning not a ton of stop and go, flat terrain at or slightly below sea level. Really the only differences are the lack of humidity and higher temps. The drop in MPG is slight so it's no big deal, it just got my attention and made me wonder.
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post #9 of 24 Old 07-19-2019, 12:05 PM
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I live in CA and I average 16 to 17 according to the truck, mostly freeway driving. The double swipe on the gas pump is a regular deal. In fact I usually fill when I am half, it makes feel like I am not spending so much. Maybe the driving you are doing has changed?


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post #10 of 24 Old 07-19-2019, 01:58 PM
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Where in AZ are you now driving??



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