Improving 7.3L Mileage
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Originally Posted by MobeyDick
I've never had a problem with my K&N it has 254,000 milkes on it. Forget about Programmers/Chips for fuel mileage. I've Tried 3, including DP Tuner and none of them have increased my fuel mileage. As a matter of fact they cut my Fuel mileage. You can't get better fuel mileage by adding more fuel. Best thing you can do is make sure you have Good Fuel. Tires are properly inflated and keep the speed down.
New User
Joined: Apr 2007
Posts: 15
Likes: 0
From: Michigan
It's not about adding more fuel. It's how your chip / programmer is programmed. They adjust timing, pulse width of how long the injector shoots fuel, and air fuel balance. There is also a lot more to it. You might want to try resetting your trip meter up above or your average miles per gallon because if your fuel economy went down then there is definetly a problem. Even when I decide to gun my truck the worst I have seen my fuel economy drop to is 17 mpg and that's beating on it!! I'll take 17 anyday over the 13.5 I got stock!!
New User
Joined: Apr 2007
Posts: 15
Likes: 0
From: Michigan
Well.... when you reset your computer in your truck, look at the miles on your truck after a fill up, and do the math and all three equal the same number or are within .3 my guess is that's what I'm getting for fuel economy. But what do I know!!
I mean anywhere from 500 to 550 trip miles to a tank divided by 26 gallon tank = 19.3 to 21 mpg. FYI thats in town!!
I mean anywhere from 500 to 550 trip miles to a tank divided by 26 gallon tank = 19.3 to 21 mpg. FYI thats in town!!
Thread Starter
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Junior User
Joined: Aug 2004
Posts: 83
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From: North Dakota
How large is the tank on these superduty's. I tried to look in the owners manual, but I could not really find a spot for f-250 supercab shortbox, which is what I have. So it looks like my best bet is to remove the muffler, upgrade the air intake, and get a six position chip for mileage? Would getting the larger turbo downpipe help also or is that not nessesary?
New User
Joined: Apr 2007
Posts: 15
Likes: 0
From: Michigan
I have a crew cab short box and its 26 gallons and yours could be a 28 or 29 gallon. I would also reccomend getting a 4in. turbo back exhaust from MBRP or Banks because they are mandrel bent t-409 stainless and would out perform a stock exhast any day. A Banks exhaust for example eliminates 228% of backpressure compared to stock exhaust. In other words it allows your truck to push out the exhaust easier.
Snowboard season cometh..
Joined: Jan 2006
Posts: 5,406
Likes: 1
From: Gulf Coast of Florida
Originally Posted by F350-6
MPG is all about RPM's and how quickly or slowly you get there.
) - when you fight that kind of wind, mileage suffers, no two ways about itFWIW I'm driving in Wyoming and this is NORMAL... no wonder the state is so sparsely populated....
More Turbo
Joined: Feb 2004
Posts: 509
Likes: 3
From: Findlay, Il
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Lead Driver
Joined: Dec 2003
Posts: 5,250
Likes: 42
Originally Posted by Black Smoke 02
I have a crew cab short box and its 26 gallons and yours could be a 28 or 29 gallon.
Shortbox = 29 gallon
Longbox = 38 gallon
Unless they were changed by someone, that is they way ford put them out.
Elder User
Joined: Jul 2006
Posts: 530
Likes: 0
From: Vancouver, Washington
Hand calculated MPG can vary
Another interesting note on filling up your diesel. I always run hand-calculated numbers and never thought about how diesel foams. I always filled it up until the pump shut off, then called it good. Thought about it the other day and "topped-off" my tank after the pump shut-off. It took an extra 3.2 gallons of diesel (38 gallon tank) This won't throw off your numbers a bunch, but if you use different pumps that agitate the diesel more than another, it can give you a different "full" reading. Just my .02
Side-note: anyone with a 7.3 running SAE 30 Delo 400 instead of 15-40 Delo? Thinking about trying it, wasn't sure what people thought (not trying to rob the thread, feel free to PM me)
Thanks
2002 CC LB 4x4 AT
Side-note: anyone with a 7.3 running SAE 30 Delo 400 instead of 15-40 Delo? Thinking about trying it, wasn't sure what people thought (not trying to rob the thread, feel free to PM me)
Thanks
2002 CC LB 4x4 AT
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
The only way it would make a fairly large difference in the calculation is if you filled it to the neck (with fuel, not foam) first then only filled it until it shut off once the next time.
As far as the SAE 30, I'd stick with the multi-vis because the manufacturer calls for it. I think the engine would wear a bit less with the lighter oil when it's cool and the heavier oil once it's warmed up, IMHO.
Joe
As far as the SAE 30, I'd stick with the multi-vis because the manufacturer calls for it. I think the engine would wear a bit less with the lighter oil when it's cool and the heavier oil once it's warmed up, IMHO.
Joe
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Originally Posted by papadelogan
I can't agree with you 100% on this... RPMs will have a big affect, but my drive to work regularly has me in a 25mph+ crosswind, and sometimes nearing 50mph (or more!!! ) - when you fight that kind of wind, mileage suffers, no two ways about it
) - when you fight that kind of wind, mileage suffers, no two ways about it