Traded my 98.5 ,2500, 3.55 for 2001 3500 DRW 4.10 both auto, fuel milage stinks in 3500 14mpg,my 2500 was getting 17mpg.Checked fuel pressure 13 idle & 5 to 6 wot.I've read post where people are getting as high as 18 to 20 with 4.10.Maybe it will get better when I install edge ez ,k&n,& 4" magnaflow,15 or 16 would be nice.May need new lift pump.



2001, 3500,4.10 auto K&N

 

every one of these trucks are different, and there are a ton of factors that play into fuel mileage.

You are anticipating on spending close to a grand on mods to get your mileage up. How long do you plan on keeping this truck? Because for those mods to pay for themselves in fuel mileage gains is gonna take you awile unless you go the cheap way.

1. used edge (gave me no mileage increase) (300-400 bucks)
2. pay local garage to straight pipe in 3" (40-60 bucks), or DIY or cost of pipe.
3. bhaf (35-50 bucks)

These may gain you 1-2 mpgs.

These trucks get great mileage for what they are. Try running a gasser that pulls as good as the cummins, and you will go broke filling it up. Besides, you could have computer problems that throwing pricey performance mods at wont help.

Try replacing Fuel Filter
Try resetting APPS
Try shifting @ 18k-2k rpms for a whole tank.(oh yeah, your an auto,,,thats your main prob.. )
Try staying 65mph and under for a whole tank.


try some of these things before spending all that money. They might help.

 

How many miles are on it??

 

TRUCK HAS 70,000 MILES.

 

2 wheel or 4 wheel? tire size? tread pattern and psi?

 

2 wheel drive,235/85 cooper road tread,80 psi

 

With my set up I am getting 17 mpg in mixed driving. Though with my box turned up, I can suck it down to 14 mpg for a tank. This is all hand calculated. I would thank that being a two wheel drive, your mileage should be a little higher. All I know is that the best way to up the mpg's is to watch your right foot cause it likes to play when it knows you aren't paying attention.

 

I got approximately (hand calculated) 16.2mpg on my last 17.5 gallons of fuel. I usually only calculate the first half tank because I don't like letting it get below a quarter. Between half and a quarter I'm on the lookout for the cheapest prices.
The truck was empty; highway driving about 70mph; 40* to 60* outdoor temps.
With the camper on, I've never been below 11.5mpg....summer or winter.
btw, guages are on their way, so I can't tell you what my FP is like. Also 235/85-16 @ 80psi.

 

Most of these guys are pulling your leg when they say their getting 20mpg, either that or they just dont know any better. 14mpg is pretty average for DRW

 

I don't know about 20 but I'm averaging 95% highway speed and average 18.5 now with summer blend fuel on the dually listed in my sig. All hand calculated, using roughly 28 gallon fillups, add in 16 oz of PS to each tank. It does drop off to 17ish with winter blend fuel. WITH 4.10's, from there we are talking about a 6sp vs. the auto, not sure what the final drive gear in the tranny's are on either, but all other things being equal that would be the determining factor.

Dave

 

ALL HONESTLY...
i have an 01 DRW w/4:10's six speed. original tires. all bolt on modifications. i bought this new. i am getting 21-24mpg highway....i use this as a commuter daily driver with no load. getting 16-19mpg city.

i cruise to work, 60 mins highway, at 75mph.

 

ive got a 01 look at my profile,its auto 4x4 and last week was the best my truck ever got going to new york and back to Pa. i got 625miles out of a tank that is like 19-20 and that is with a auto . my brother in laws 01 6spd does better than me,the edge box does not increase milage, mine is worse when it is on,and ive got a comp box, my fuel milage went up after i changed the injection pump when the old one went bad, every truck is different and everyone drives fifferent,i watch the overhead consols fuel milage gauge when the box is off thats how i know how much to be in the throttle,i believe that the guys on here are not lying about fuel milage,my 95 got 28mpg . should of kept that one