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Old 07-27-2021, 06:35 PM   #1
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7.3 Gas real world MPG

So I bought my F350 with the "Godzilla" motor. When I drove it home (24 hours of driving) the mileage was about 14.5 on average. I live in the mountains and have never really been able to test it on flat ground. I towed a trailer for a friend down to Florida and while headed home without the trailer I was able to check the level driving mileage. I put the cruise on various speeds and rolled for ten miles or so to get a reading. I got 18.5mpg with the cruise set on 70 and 19.5 on 55. Towing wise, regardless of the rig I have hooked to, I have gotten 11.5. The truck only has 5,000 miles on it and the mpg seems to have picked up since new.



Each of these numbers actually beats my former 2003 Silverado.
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Old 07-27-2021, 06:36 PM   #2
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I will add that this was on "eco mode" and is purely for curiosity as I never get to drive on flat land.


As to my satisfaction, I love it. I don't tow every day, but when I do, it really performs. I have no regrets getting it in my truck. With the new regulations regarding diesels and the negative impacts of the environmental controls, I think this engine was the perfect choice. Though I say I don't tow all the time, well over half the miles on the truck are from towing as I am generally towing when I head out of town these days (retired!).
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Old 07-28-2021, 08:27 AM   #3
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Thanks for posting this information.

That is much better than I thought it would be. Must be the 10 speed transmission helping to push that mpg up into the high teens.

I have an old 2017 F-250 6.2 boss. Driving on a level highway I can see 16.5mpg on the lie-o-meter on my 2WD truck.
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Old 07-28-2021, 08:51 AM   #4
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Sorry, just got to post this.. had a friend's dad bought beautiful 1975 t bird ford bb, and it would get 4 to6 mpg.. and we had just been through 2 oil crisis... now that t bird weigh about 1/2 of you f350.. how long do you think overdrive in 10 or 8 speed or 6 speed trans will last.. monitor your trans oil temp.. ford smells money when oil starts getting over 220.. and you bet.. computers are watching and recording temps.. to claim abuse when you need replacement.. that said if you under coat and paint protect every yr.. it will last.. a long time.. I also remember light duty pickups getting 8 to 10. With no load.. so for that size truck.. man. That is great.. should last until oil runs out.. good luck..
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Old 07-28-2021, 09:11 AM   #5
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That's damn impressive for any truck, let alone an F350 with a 7+ liter motor! It can't simply be the 10 spd tranny because I've got the 3.5EB V6 in my '18 F150 with the 10 spd and I average between 16-18 MPG around town (mix of suburban and xway), seen a best 24 MPG on 1100 mile x-way trip across the semi-flat midwest, and only 10 MPG when towing a sub-5000# trailer.

My guess? That mileage is because you're not working/stressing "Godzilla" very hard. What diff ratio are you running?
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Old 07-28-2021, 09:37 AM   #6
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10 miles of driving isn't a real MPG reading.

You didn't just pop onto the highway at 70 MPH. You have to get there.

An average reading has startups, accelerations, braking, turns, ups, downs, and stops.

I got 11 MPGs in 10 miles, coming down of the Blue Ridge mountians. Then back to 7 MPG.
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Old 07-28-2021, 10:04 AM   #7
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Pulling the same load a the old Ford 6 speed 5.0litre V8 would get 2 mpg better than a Honda 3.5 litre V6 pulling that same load. The Honda was a 5 speed.

The little engine working hard did in fact use more gasoline than the Ford 5.0 litre.

Solo - the Honda got 17 while the Ford got 19. Again about 2 mpg better.
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Old 07-28-2021, 11:50 AM   #8
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I get 14 to 15 mpg around town. Pulling my 35' fifth wheel I get between 7 to 8 mpg. The 6.7 diesel only got 10 mpg towing. Power is fine just a little noisier than the diesel because the rpms are higher going uphill.
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Old 07-28-2021, 02:01 PM   #9
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I've had a couple Ford F350s with the old 460 V8, manual tranny and 4.10 gears. Neither ever got over 12 mpg running empty. 8-9 mpg pulling a load. I have an E350 now with the V10 and it has never seen over 12 mpg. So that new drivetrain is getting much better mileage.
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Old 07-28-2021, 04:14 PM   #10
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2020 F350 crew cab long bed 4x4 with 3.73 axle and 7.3L gas engine.

I burned a tank last week running back and forth repeatedly between the eastern and western suburbs of Detroit (flat lands). 90% of that was freeway at 60-70mph with a little puttering around at each end. 650 miles into the tank, I put in 43.6 gallons. That's 14.9mpg. The trip meter reported 15.6mpg for that tank. The meter meter typically reads a little higher than my calculated value.

Driving around locally, I typically see 11-13mpg (calculated when I fill the tank).

Towing my 5th wheel, 8-9mpg is typical. I limit speed to around 63mph.
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Old 07-29-2021, 04:13 PM   #11
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I have had my 2020 F250 CC LWB 4x4 7.3 3.73 gears for just over a year now, 20K miles on her.
Around town I hover in the 14-14.5 range.
Open highway the best I have pulled so far is 17.5
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Old 07-29-2021, 04:43 PM   #12
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You guys are changing my thoughts. I had thought the 7.3 was a gas hog but I do not think that any longer. Getting over 17 on the highway is great.
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Old 07-29-2021, 08:10 PM   #13
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Quote:
Originally Posted by twinboat View Post
10 miles of driving isn't a real MPG reading.

You didn't just pop onto the highway at 70 MPH. You have to get there.

An average reading has startups, accelerations, braking, turns, ups, downs, and stops.

I got 11 MPGs in 10 miles, coming down of the Blue Ridge mountians. Then back to 7 MPG.

Right...as stated, I was curious what I would get on a flat straight line road since I don't have such things. Yes, I do get on the highway and get off when driving long distance once at a minimum per tank. I am not stating that it gets and average of 18, but that you can get 18 on the highway.



The point is the unloaded cruising MPG...and that it has gone up since day one.
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Old 07-29-2021, 08:12 PM   #14
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Originally Posted by Badjuju View Post
What diff ratio are you running?

3.73
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