2011 vs 2015 Fuel milage & power - Ford Powerstroke Diesel Forum
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post #1 of 31 Old 08-06-2019, 09:02 PM Thread Starter
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2011 vs 2015 Fuel milage & power

Hey Yall,
So today I test drove a 2011 f350 4 door short wheel base with the lariat package. I also drove a pretty much the same 2015. The dealer said the 2011 had a bad turbo on arrival and they replaced it.
Surprisingly the 2011 seemed a little more powerful and snappy. I drove each truck around about a 10 mile loop, and tried to drive each truck the same. I reset the mpg setting in each truck as I left the dealership. The 2011 said it was getting 14.8mpg when we returned. The 2015 said it was only getting 12mph. Can there really be that big of a difference in mpg? I would have thought the 2015 would feel more powerful and get better MPG, but it was the other way around.
Anyone have any thoughts or reasons why this was the case?
Thanks!
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post #2 of 31 Old 08-07-2019, 02:18 AM
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Don't believe the dash MPG numbers.

As far as the "power" when driving that's on you. My 2015 modded has plenty of pull on the low end BUT has a tad bit of lag. That's just the nature of the OEM turbo. It's there for pulling/towing not drag racing.
I've never driven an 11-14 to compare myself just to be clear.
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post #3 of 31 Old 08-07-2019, 04:07 AM
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the 11-14 has a lot more off throttle snap compared to the 15-16. 15-16 is overall a better truck.
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post #4 of 31 Old 08-07-2019, 04:11 AM
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If you can afford the 15, get it. The reason why the 11 felt more powerful/quicker was because of the turbo design. It essentially has 2 impellers to help with spool time. If you get the 11 and plan to mod it, the new turbo could be on borrowed time depending what tune you would run. The 15 has the better turbo design, and guys with the 11-14 trucks often swap to a 15+ turbo and HPFP.

Like Heavy said, the dash numbers aren't accurate. It also comes down to your right foot depending where you want to be for MPG.
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post #5 of 31 Old 08-07-2019, 04:54 AM Thread Starter
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I realize it all depends on how I drive the truck, but what kind of fuel milage can i expect to get out of the 15 with just decent normal driving, highway and in town? To be honest the fuel mileage I seen on my test drive kinda scared me off a bit on that particular truck.
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post #6 of 31 Old 08-07-2019, 11:59 AM
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15 uses more fuel by design. = more HP/TQ and more reliable turbo with the tradeoff of spool up lag.


Make sure the '11 is late release. Very early ones had some valve issues. I don't think the turbo is necessarily 'bad' on the 11-14 so long as you run stock configuration and keep the pressure at 20psi or less. Higher pressure tunes will over spool and burn up the ceramic bearings.

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post #7 of 31 Old 08-07-2019, 12:10 PM
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Talking about MPG, you do realize it's a truck right? Diesel's get better mileage than gassers but they're still not a Prius.
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post #8 of 31 Old 08-07-2019, 02:41 PM
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'15 should see about 14 City...maybe touch 18 HWY. Those are dependent on your local area.



Modded trucks can generally see a solid 16+ city and easily over 18 HWY.



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post #9 of 31 Old 08-07-2019, 06:56 PM Thread Starter
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Quote:
Originally Posted by jman37 View Post
Talking about MPG, you do realize it's a truck right? Diesel's get better mileage than gassers but they're still not a Prius.
Haha, of course I realize it is a truck! However, I still expect to get decent MPG For a Truck. I'm not expecting anything crazy but 15ish would be good. Definitely don't want to be in the 11 range. You hear all these people claiming 20 or more out of their diesels. I don't expect that. Just something decent.
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post #10 of 31 Old 08-08-2019, 06:41 AM
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I've got a 15 F350 SRW. 3.55 Rear end.

Bear in mind I've only had the truck about 2 Months, but have put about 4K miles on it, pretty even mix of 5th wheel towing, Highway, and city Driving.

City, I average about 10 - 11 mpg. But I have a heavy foot.

Towing the 10K lb 5th wheel, I get between 9.5 and 11.5 at 65 - 70 mph. Depending on where a regen falls when I check my mileage. I could maybe push 12mpg towing if I kept it at 60 and didn't have a regen.

Highway unloaded I have the least info on, but i've got 17.5 on one occasion and 16 ish on another.

I had hoped for better economy, but thats just the nature of the beast.
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