2001 f-350 low mpg researched - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 12-01-2019, 04:35 PM Thread Starter
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2001 f-350 low mpg researched

Good afternoon everyone i have a 01 f-350 4x4 3.73 crew cab long bed lifted 4" on 315s

The problem i have had for a while is getting low mpg I started with 6 MPG not towing anything. I replaced the brakes front and rear because they were dragging and numerous of other parts including glow plugs, injector harnesses, new manifolds, up pipes, wicked wheel, atp turbo housing, wastegate, ebp line and sensor, map sensor, tank filters and numerous other maintenance items. With all the upgrades and replacement parts I only increased to 7.5 mpg which still sucks.

Towing I can get 6 mpg max

Hubs seem okay transmission was rebuilt before I purchased it. Doesnt seem to lack power

Doesnt overheat trans temps are good and egts stay under 1000 when towing

Not sure what else to check other than replacing the injectors. Does anyone have any ideas?

Thank you
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post #2 of 8 Old 12-01-2019, 04:54 PM
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Are you sure you are calculating correctly? Are you blowing smoke? Possibly leaking? Idling a lot? I'd look for a leak personally.

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post #3 of 8 Old 12-01-2019, 05:09 PM Thread Starter
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I tested multiple times with fuel tracking app and manually tracking I same results.

No visible fuel leaks when idling and I dont idle for long either.
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post #4 of 8 Old 12-01-2019, 05:33 PM Thread Starter
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265k miles on motor
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post #5 of 8 Old 12-01-2019, 09:22 PM
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My first thought is the speedometer is not showing correct speed. If so, due to the 35" tires, this will also affect the odometer and from my experience, about 10-11%. If I am correct, try multiplying your mileage by 1.10 and use the new calculated number for fuel mileage.

Besides that, the driver makes the largest difference in fuel economy. Try driving slower than your grandpa for a whole tank of fuel. It is darn near impossible but usually reveals results. Also, longer drives between 45-60 mph will net the best economy. Much below or above and economy seemed to start fading. Above 70 mph and it down right starts to drop, quickly.

I have a SCSB 4x4 with 33's and 4.30 gears. I average 13.5 mpg with 440k on the engine. Just installed new injectors without much change but the 4.30 gear happened at the same time. I believe I will be putting 3.73's in soon.
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post #6 of 8 Old 12-02-2019, 01:57 AM
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Quote:
Originally Posted by Turbostang500 View Post
My first thought is the speedometer is not showing correct speed. If so, due to the 35" tires, this will also affect the odometer and from my experience, about 10-11%. If I am correct, try multiplying your mileage by 1.10 and use the new calculated number for fuel mileage.



Besides that, the driver makes the largest difference in fuel economy. Try driving slower than your grandpa for a whole tank of fuel. It is darn near impossible but usually reveals results. Also, longer drives between 45-60 mph will net the best economy. Much below or above and economy seemed to start fading. Above 70 mph and it down right starts to drop, quickly.



I have a SCSB 4x4 with 33's and 4.30 gears. I average 13.5 mpg with 440k on the engine. Just installed new injectors without much change but the 4.30 gear happened at the same time. I believe I will be putting 3.73's in soon.
That is what I meant by miscalculation. I have 235k and get 14-17mpg depending on what I am doing. No way he is at 6 without a fuel leak, hot tune, or a miscalculation (such as misfunctioning odomoter).

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post #7 of 8 Old 12-10-2019, 12:20 PM
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Why do people just drop off and not update the forum?

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post #8 of 8 Old 12-11-2019, 04:36 AM
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Frustrating....
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