Need Help Here?
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Junior User
Joined: Aug 2003
Posts: 70
Likes: 0
From: Groves, Texas
Need Help Here?
Ok, here it is. My MPG on my truck sucks big time. I read these threads where somebody gets between 700 and 750 miles to a tank of diesel. On another thread some body said his fuel gauge mark does'nt move off of full until about 100 miles. Mine moves off of full around 35 miles. I get around maybe between 350 and 400 miles to a tank of diesel. I average around 12 in the city and around 15 to 16 on the highway, an thats running empty, not pulling nuttin. I have a 2001 Superduty, of course with the 7.3 Diesel, crewcab, 4x4, shortbed. I have changed my exhaust from stock to a 4" Dynomax from turbo back. I have it lifted 4" with a superlift, I have the AIS intake, I recently added the 10 K mod, I do run 35" BFG all-terrains which will make a difference in my MPG's but I have been getting crappy mileage from the getgo. What can I do to improve this. My truck is a daily driver from going to work to the grocery store. My wife loves it but she is starting to get the reda** about the MPG's. I do try to keep my RPM's under 2000 or around 2000 when I am at cruising speed. Anyways HELP ME. 
later 
later
Post Fiend
Joined: Aug 2002
Posts: 5,324
Likes: 1
From: Denton,TX
First of all, since you have the shortbed you have the small tank, not the 38 gallon tank that will get you 700-750 miles/tank. Your mileage doesn't sound that far off to me for a CC 4x4. Do you gun it on starts? That will make a huge difference.
Thread Starter
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Junior User
Joined: Aug 2003
Posts: 70
Likes: 0
From: Groves, Texas
Thanks johnsdiesel for the quick reply. I never even thought about my tank size when I read that somebody was getting 700 to 750 miles to a tank. Your right, he probably has the 38 gallon tank. Wow, am I bad. Well if my mileage seems to be pretty close to the norm then I guess I will just have to live with it. Sure aint gettin rid of it. Any way thanks again fellow Texan.
Elder User
Joined: Feb 2004
Posts: 573
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From: Spring City, Pennsylvania
Based on previously owning trucks and then lifting them your mileage will go down probably 1-3 mpg with larger tires, especially with city driving. Sometimes you can get a little better mpg's with larger tires on the highway because you lower your gear ratio a little. I wouldn't sweat it bud, it doesn't sound too bad. I would definitely run Diesel Kleen or Standadyne in your truck if you're not already. That may help you a little in the mpg area, but atleast your truck will be running much better.
