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Discussion Starter #1
My 2003 F-250 is just drinking the diesel. I do good and get about 15 mpg then all of a sudden it drops to 10-12. This is while I'm hauling campers. It's done it twice now. What is going on? My truck has new injectiors and the trans was done awhile ago. I have 330,000 on her, but I don't beat on her. Any ideas? I'm stumped. I clean out the air filter, and ran diesel cleaner through. It ran fine and it started again last night. It happens when I'm hauling through Nebraska and Wyoming. The hills are just killing me. I'd appreciate any ideas.
 

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I towed my 7000lb bumper pull RV trailer 600 miles this last week. On different tanks I would be at 15 and then at 10 mpg.

You have two reasons for the variation. One is fuel quality, especially in the midwest they have poorer fuel and maybe even some winter fuel still. More importantly though is headwind/tailwind. Especially with a camper, your frontal area is huge and a huge amount of fuel is spent just pushing that thing through still air, add a 30 mph headwind and the fuel consumption goes way up. A 30 mph tail wind and things will improve.

These things suck fuel when working.

My last 150 miles or so was into a steady headwind and my OEM power level truck was struggling.
 

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I just got back lastnight and the hills out west killed me. I went through more fuel than last time. My truck just seems tired. Anyway to up the power without breaking the bank?
 

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Welcome to the board. To help you out we need to know about your vehicle, take a look at the signature below my first post here as an example.

I was thinking the same thing about a bit more power. See, my 2000 made only about 235 HP and new trucks are well on their way to 400. We need more power just to keep up! The first 65 HP to get me up to 300 is easy and cheap. After that it starts getting a little bit more expensive but up to about 400 is still reasonable.

With these power upgrades you need to also think about your transmission. MPG will not change by much.
 

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Discussion Starter #5
my truck is a 2003 f250 that is bone stock, with 340k on her with a 7.3 powerstroke, not the 6.0
 
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