Which Rear End Do I Have?
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Senior User
Joined: Sep 2007
Posts: 335
Likes: 1
From: Richmond, Texas
Thread Starter
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Senior User
Joined: Sep 2007
Posts: 335
Likes: 1
From: Richmond, Texas
I've only run through one tank. I got 14.1 or something like that. I'm getting about 11.5 so far on the 2nd tank.
When it was time to fill-up, the dash said I had burned 21.1 gallons, but I could only get 20.9 into it, so something is "off".
When it was time to fill-up, the dash said I had burned 21.1 gallons, but I could only get 20.9 into it, so something is "off".
Fleet Mechanic
Joined: Oct 2006
Posts: 1,351
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From: North Florida
Mine is usually off like that, saying that I used about a gallon more than I can fit in.
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Senior User
Joined: Sep 2007
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From: Richmond, Texas
I'll keep tracking the mileage. This morning I was on an open stretch of straight, flat highway, so I set CC at 65mph and reset the instant fuel economy feature on the dash. I was getting between 14.5 and 15mpg. I expected closer to 20mpg at 65mph unloaded on a flat road.
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Senior User
Joined: Sep 2007
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From: Richmond, Texas
Maybe I'll put the 2015 in the garage to keep it clean for date night, and drive the ole 7.3 to save money on fuel. On 2nd thought, I think I'm addicted to the air-conditioned seats!
Lead Driver
Joined: Jan 2008
Posts: 6,180
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From: Georgia
We see a mile or better per gallon difference here when the summer blend diesel gets to our area and has not been mixed with the winter blend. All my diesels have gotten better mileage in the warmer months. I guess because they like it 'hot'!
Posting Guru
Joined: Aug 2007
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From: BA, OK
I took a 200 mile mostly flat hwy joy ride unloaded during the breakin on my truck. Speeds varied from 75-80 for the first 100 and 70-75 for the trip back. Fueled up then got on the hwy, when I got back in town trip A was showing 17.0 mpg for that tank of fuel. It was slightly windy and during the month of January. 2016 F250 Crew Cab Short Bed 20" stock wheels and tires with 3.55 axles.
I'm sure that's a bit low since the motor is still tight. Haven't had anything close to that since that day, I always have something hitched to the bumper.
I'm sure that's a bit low since the motor is still tight. Haven't had anything close to that since that day, I always have something hitched to the bumper.
Lead Driver
Joined: Dec 2013
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Unloaded - I get between 11.5 - 17.5. Right now my city/hwy mix I am getting 13.5. In the summer it will go up to 14.5 - 15.
If you want to see 20 - long steady driving at around 45 mph. Right when the truck hits 6th gear.
Idling and stop and go traffic kill mileage... Regens over the course of a tank are responsible for around .5 mpg. Just my observations. Some people do better than I do others worse.
Overall I get less MPG than my 6.0, but this tuck spends it's time with me and not the dealer.
If you want to see 20 - long steady driving at around 45 mph. Right when the truck hits 6th gear.
Idling and stop and go traffic kill mileage... Regens over the course of a tank are responsible for around .5 mpg. Just my observations. Some people do better than I do others worse.
Overall I get less MPG than my 6.0, but this tuck spends it's time with me and not the dealer.
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