LHartman

I run 295/75's on mine w/ 4:10's. At 2000 RPM I'm at about 64 mph. The best I've ever got was around 17 mpg. Typically I get 13.5 mpg.

WHIFF

I have 3:55s, and a 5-spd. on 285 tires. I used to get about 18 combined, but now that I slid the stock plate forward, I get about 14 or so. And lots of smoke on all starts off the line, unless I just barely press the accelerator. I was hoping to get better mileage than this! I was told bumping the timing up to 15.5* or so would help mileage. Any thoughts?

Paul Winey

Cumminsdude:<br><br>You may want to run a tank through with an additive to clean things out. I've been running Power Service and was where you were but now am at 17 - 18, mixed city/highway, 4.10, 4X4, stock tires. I also had my fuel pressure checked. It was low because of a bad overflow valve (also caused lower power). Check your fuel filter, prefilter also. Try those things then recheck mileage. Good Luck.<br><br>Paul<br>

Ranch Hand

I have a 98.5 3500 QC with 355's &amp; auto<br>first tank ran it pretty hard and got 16.1<br>cleaned the IAT and didn't get it over the 2000 rpm mark.<br>got 14.1. guess I should have got a power stroke.

royB

well, I thought I was doing ok till I read this and nowI wonder. 2001, 3500 4x4, 3.55, stock tire size. Running empty mostly interstate (100 limes a day, only 6 are off the interstate) 65-75 I am getting about 17.5 avg. Like I said, thought that was not bad but now am thinking that I could/should get more. Truck runs great (I think, it's my first diesel) Have been running Power Service since I got it 3 weeks ago, think I should change the fuel filter since I don't know when it was changed last? I'm still working on the gauges (the finance manager at home has limited spending for now) so I don't know what the pressure is but it does not smoke EVER, not even taking off hard.<br><br>thanks for all the help, not directly to me, but reading the site has answered most of my questions/concerns.<br>

Cumminsdude

[quote author=Bubba_PA link=board=13;threadid=17099;start=15#160617 date=1058378884]<br>Cumminsdude:<br><br>You may want to run a tank through with an additive to clean things out. I've been running Power Service and was where you were but now am at 17 - 18, mixed city/highway, 4.10, 4X4, stock tires. I also had my fuel pressure checked. It was low because of a bad overflow valve (also caused lower power). Check your fuel filter, prefilter also. Try those things then recheck mileage. Good Luck.<br><br>Paul<br><br>[/quote]<br><br>Thats funny because yestarday I picked up a bottle of power service and put it in my truck so I will let you know what happens. Also I am changing my oil soon so I am doing my fuel then also. Whats the prefilter? And my truck goes in tomorrow to the shop so they can look at my steering and I will ask if they can check my fuel pressure. Thanks for all the help, EVERYONE!!!

Bearfoot2

[quote author=Ranch Hand link=board=13;threadid=17099;start=15#160871 date=1058411069]<br> guess I should have got a power stroke.<br>[/quote]<br><br>You want real trouble? ;D

PumpDaddy

I get 19 MPG EASY unloaded with snow ***** coming from the dash, ;D ;D momma rapped up in a blanket complaining about the cold, and asking &quot;ARE WE THERE YET&quot;, running 70 mph is about 1800-1900 rpm, 2000-2100 will get me about 73-74, but I've got a bad habit of flooring it to get there faster, even driving like I was 20 again, the worst I've seen is 15 1/2 mpg. If I feel the need to get muddy, we put the CJ-5 on the trailer and go to the woods and act a fool, 4 wheelin ain't needed on the streets here, unless tarffic ain't moving and ya gotta go pee

blh1960

I'm pushing close to 80 mph at 2000rpm with my 3:55's. This is with 315 tires. This was was checked with a GPS.

cmckinney

I run BFG's A/T 295/75R16's on my truck. <br><br>5-sp 3.55 rearend. I avg about 18.4-18.7 mpg on the last 2 tanks.<br><br>I avg'd 19.5-21.2 mpg with Michilen 265/75R16 LTX A/S tires before the tire change.<br><br>Just a point of reference for you but looks like your truck may be running a little low on MPG however CTD's vary a lot per driver and setup.<br><br>-CM<br><br>

ramman21921

My average is about 14mpg around town and 20mpg on the highway on a trip. I am usually running speeds of 75 to 80 mph. I made a trip to Louisiana and set cruise at 68mph in Virginia and averaged 24mpg.

Cumminsdude

Well guys I just changed my oil and fuel filter and the fuel filter was pretty black. I have no idea what it is supposed to look like but maybe this will help. I have about 3/4 of a tank of fuel left so I will calculate when I refill and if it helped it should balance out.

Ranch Hand

Ok heres what I have done. Did oil change, cleaned the IAT(wasn't noticably dirty) new air filter, and drove it like I stole it. combination city and highway 16.3.
can't reall complain about that.
The dakota r/t only got 13.9 with an egg on the throttle.
Now I have a real truck that gets better.

just_crankin_it

Before I traded in my 01 1500 5.2 5 spd 2x4 I used to get 12 or so when I drove it like I stole it and 15-16 when I drove more conservatively, now with my 01 3500 dually auto with 4:10’s I get on average 16.5 that’s hauling *** on the highway (usually put 100 miles a day) at 80 to 90 mph. At those speed I’m usually around 2500 to 2800 rpm. Just my 2cents

Cumminsdude

hmmm well I checked it again today and it was at 12.9 and thats hauling a car for about 150 miles or so. I dont know I am going to drive a little more easily this time and see what I can do.