Fuel Milage
Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
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What trans and gearing? NA or Turbo?
There are a lot of things that affect MPG. My '88 e250 NA 7.3 c6/DNE2 3.54 gears get anywhere between 14-19mpg depending on city/hwy, time of year, cruising speed, terrain, driving style, tire pressure and style....... etc etc etc.
My last tank was 16.16mpg. That was about 60/40 hwy/city. Most cruising at 65mph.....some at 70mph. On winter fuel in hilly terrain.
There are a lot of things that affect MPG. My '88 e250 NA 7.3 c6/DNE2 3.54 gears get anywhere between 14-19mpg depending on city/hwy, time of year, cruising speed, terrain, driving style, tire pressure and style....... etc etc etc.
My last tank was 16.16mpg. That was about 60/40 hwy/city. Most cruising at 65mph.....some at 70mph. On winter fuel in hilly terrain.
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
Idling and 4x4 use affects it quite a bit.
Usually, I'm in the 16-ish range with my normal driving; thanks to quite a bit of idling due to the cold and driving through snow, I hit 12MPG tank average the last couple of tanks.
Last time I took a trip(99% highway, summer), I averaged 18MPG for the trip.
Usually, I'm in the 16-ish range with my normal driving; thanks to quite a bit of idling due to the cold and driving through snow, I hit 12MPG tank average the last couple of tanks.
Last time I took a trip(99% highway, summer), I averaged 18MPG for the trip.
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New User
Joined: Jan 2016
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OTE=jayro88;15934776]What trans and gearing? NA or Turbo
There are a lot of things that affect MPG. My '88 e250 NA 7.3 c6/DNE2 3.54 gears get anywhere between 14-19mpg depending on city/hwy, time of year, cruising speed, terrain, driving style, tire pressure and style....... etc etc etc.
My last tank was 16.16mpg. That was about 60/40 hwy/city. Most cruising at 65mph.....some at 70mph. On winter fuel in hilly terrain.[/QUOTE]
It's a 2WD manual turbo diesel, I'm not sure about the gearing, im a beginner at all this
There are a lot of things that affect MPG. My '88 e250 NA 7.3 c6/DNE2 3.54 gears get anywhere between 14-19mpg depending on city/hwy, time of year, cruising speed, terrain, driving style, tire pressure and style....... etc etc etc.
My last tank was 16.16mpg. That was about 60/40 hwy/city. Most cruising at 65mph.....some at 70mph. On winter fuel in hilly terrain.[/QUOTE]
It's a 2WD manual turbo diesel, I'm not sure about the gearing, im a beginner at all this
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New User
Joined: Jan 2016
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Well what all do you need to know? I'm just starting out and stuff, so I don't exactly know
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Look on the driver's door jamb for a sticker. Look for the AXLE code, should be two digits, and post it. That'll indicate the diff ratio. Is it a pickup or a cab & chassis? Most common pickup ratios are:
C9 - 3.55 LS
39 - 3.55 open
C5 - 4.10 LS
35 - 4.10 open
C&C trucks often have higher gears.
As for what affects mileage, see jayro88's post above. But you have about the most efficient combination, with a 2WD 5-speed. If it's a 3.55 truck, and you're really prudent on the highway and keep it under 2000 RPM, 20 MPG is within reach.
C9 - 3.55 LS
39 - 3.55 open
C5 - 4.10 LS
35 - 4.10 open
C&C trucks often have higher gears.
As for what affects mileage, see jayro88's post above. But you have about the most efficient combination, with a 2WD 5-speed. If it's a 3.55 truck, and you're really prudent on the highway and keep it under 2000 RPM, 20 MPG is within reach.
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Posting Guru
Joined: Feb 2015
Posts: 1,147
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From: NW WA
I've gotten over 20 mpg in my trucks. But that is babying it and cruising down the freeway at 55
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Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
If you are new at this, and the PO just beat it or didn't maintain it (or tune it), then it's likely you are probably getting around 10mpg with that dually. Maybe 12mpg considering it's a manual.
But you could do a lot to improve that... meh. I think when you buy a dually, you are geared with the expectation that there won't be a lot of good MPG. If you are worried about MPG, then you might want to sell that truck, then find a similar year 7.3 IDI turbo pickup with a 3.55 and manual tranny. I bet your dually is a 4.10 or worse, as they are typically geared for power. Any reason why you need a dually?
But you could do a lot to improve that... meh. I think when you buy a dually, you are geared with the expectation that there won't be a lot of good MPG. If you are worried about MPG, then you might want to sell that truck, then find a similar year 7.3 IDI turbo pickup with a 3.55 and manual tranny. I bet your dually is a 4.10 or worse, as they are typically geared for power. Any reason why you need a dually?
Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
On my old truck ('94 F250 turbo, 4x4, 5 speed, 4.10 gears, 100K miles on original everything) I never averaged better than 13 mpg on summer fuel and 12 mpg on winter fuel. I installed a new IP and it started faster and ran better but really never did any better on mileage.
Laughing Gas
Joined: Mar 2006
Posts: 1,164
Likes: 2
From: Tri-Cities, TN
On my old truck ('94 F250 turbo, 4x4, 5 speed, 4.10 gears, 100K miles on original everything) I never averaged better than 13 mpg on summer fuel and 12 mpg on winter fuel. I installed a new IP and it started faster and ran better but really never did any better on mileage.
Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
Yeah I don't know why my truck did so bad. The IP was a reman Uhaul unit and I also put in injectors from uhaul. On those injectors it ran fine but idled rough and also didn't do any better on mileage so I had to swap the originals back in.
Now the truck did have the pump turned up a bit and I did mostly city driving with it, but still, I felt like I should have been getting better mileage than a gasser.
Now the truck did have the pump turned up a bit and I did mostly city driving with it, but still, I felt like I should have been getting better mileage than a gasser.
Laughing Gas
Joined: Mar 2006
Posts: 1,164
Likes: 2
From: Tri-Cities, TN
I should note that my mileage has gone up since I put a 3" elbow and full 3" DP on it, but I don't have enough tanks to get an accurate average. Looks like maybe another .5 MPG, but every little bit helps.
Laughing Gas
Joined: Dec 2013
Posts: 884
Likes: 7
Yeah I don't know why my truck did so bad. The IP was a reman Uhaul unit and I also put in injectors from uhaul. On those injectors it ran fine but idled rough and also didn't do any better on mileage so I had to swap the originals back in.
Now the truck did have the pump turned up a bit and I did mostly city driving with it, but still, I felt like I should have been getting better mileage than a gasser.
Now the truck did have the pump turned up a bit and I did mostly city driving with it, but still, I felt like I should have been getting better mileage than a gasser.
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
Try playing with the timing? Typically, as things age, the truck becomes retarded. Advance things a little and you'll gain some power back.