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  #21  
Old 08-13-2007, 09:02 AM
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WOW, mine stinks most of the time too,, ive got 80k, with 4.10s, all the goodies(Accufab intake 90 on its way from Vivian, thank you) i run Fords cetane boost(4 oz) a tank and 4 oz of 2cycle oil, with 285s and only get 13-14 maybe 15 if i keep my foot out of it , 9-10 pulling 4-7k trailer. so now ive got Nitrogen in me tires, at 70psi, and with the new Evo2, set on "tow" it mite be a little better, but i havent gooten a chance to check it. man 400-450 a tank would be great, but whatcha do?!?!? btw 46k on an '01, thats awesome!!!
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  #22  
Old 08-13-2007, 05:35 PM
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Right now in my 2000 rollin on 295/70/16 I'm averaging 17.5 to 18 in town drivin like a Papaw, driving like I want to I average 16. Highway driving Im getting 21 to 22 (Papaw) 19 to 20 (My style).

That being said my lie-o-meter is consistently 3 mpg off, so I have to hand figure and also recalculate driven miles for the larger tires.
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  #23  
Old 08-13-2007, 05:45 PM
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With 295's your probobly actually going 2-2.5 miles an hour faster then what your speedo is saying therefore your going farther then what your odometer is saying so your getting better mileage then what your computing right now.
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  #24  
Old 08-13-2007, 06:10 PM
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I have a 99.5 4x4 f250 ext. short box, 7.3 auto 4R100. K&N air filter, 285,75,16, Dp tuner 60,80,120, 5 inch exhaust with flow threw muffler from downpipe back. down pipe is 4 inch. Beating on the truck i calculate about 15 mpg. Driving a steady 60mph 20-21. Hauling a 6,000 pound loads going up and down hills i get about 15-16 depends mpg s. Driving around town i get about 15-17
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  #25  
Old 08-13-2007, 06:10 PM
Other vehicle is an F250
 

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Poor Mileage with a 2001

My PS gets poor mileage ratings too. I have managed to increase mine up from about 12 to 14 by replacing the oiled K&N with a Fram TuffGuard. The oil mist seems to mess with sensors. Take it out and you should see an improvement immediately. This resulted in about 1 mpg. The other 1 mpg came from adding 16 oz. of Diesel Kleen per fill-up.
According to my GPS, my speedometer is approx. 6.4% off with the 35s resulting in slightly better fuel economy than my calculations indicate.
I am actively trying to find the best (cheapest) way to drop it a few inches and may be willing to drop a tire size to 33s.
I also plan to install the DIY air filter.
Any other ideas?
(I have not towed anything significant yet to see how it performs with a load. If it is anything like driving in the foothills around here I will be disappointed.)
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  #26  
Old 08-17-2007, 10:24 AM
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Mine runs 16-21 mpg empty with a mix of city and highway miles. Pulling an almost 14,000 lb, 38ft fifth wheel at 70 mph, I've been getting around 11 mpg average. I use Stanadyne (or Diesel Kleen when I can't find Stanadyne), and I keep my tires at 65 psi. I try to "drive ahead" so that I can anticipate hills, slower traffic, etc. so I don't have to punch the accelerator too often, although I do occasionally "pass smoke" when the urge strikes me. And, I use a Trail Eze II wind deflector when pulling the trailer (that seems to give me almost another 1 mpg.) I not only drive like Papaw, I AM Papaw, but with an attitude.
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  #27  
Old 05-06-2011, 06:45 PM
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put a bed cover on it... ive got a 2000 350 q-cab long bed with a camper shell on it.. all stock and im getting around 18.5 to 19 hwy and around 16.5 in town..
a bed cover will help reduce the drag coming off the bed.
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  #28  
Old 05-06-2011, 07:04 PM
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I did get 17-18 town 21-22 highway until my programer fooked up and bullydog reprogramed it not i get 15t 17hw. figure that one out.
99.5 Long box. ext cab, diy intake, 4 inch turbo back, idm mod, regulated return, fuel bowl delete, power hound module. power pup(the one that screwed up) map fooler, bd wastegate actuator,........ 373s.... i think thats all
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  #29  
Old 05-06-2011, 07:10 PM
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mines all stock for now... any thing i end up doing will be for the mileage.. i drive mine about 4k a month so im on the hwy way alot... im pretty happy with mine even at that kind of mileage.. i had a f250 gas and that think never got over 10mpg.. plus i have about 1500lbs of tools and equipment in the back..
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  #30  
Old 05-06-2011, 09:55 PM
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Im getting 10 or 11 pulling 7k not meaning to take the post but i need help with this also used to get 15-16 with same trailer dropped about a month ago. Airaid intake straight piped no cats... Its running well just sucking fuel.. the are posts for all kinds of sensors going out but i wouldnt think mine would run as well as it is if one was out no missing starts good etc... If im wrong somebody please correct me with the cost of fuel im gonna go broke
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