My 01' D-Max has been getting really crappy milege lately :o: :mad: . I recently took a 550mile trip and has some town driving and averaged just over 15mpg :mad: . VA was on kill some and I ran it pretty hard a few times but I usurally get 17-18mpg doing that. Yesterday I pulled my 33' Tandem Dually with one 5K pickup on it and I got less than 10mpg :mad: . I just changed my fuel filter,cleaned the air filter and changed the oil. It's running good but seems to lack power when towing not that the VA is gone :confused:. Any idae what's up? I'm about to install EFI but want to get this figured out.

You might have a leacky injector or fuel pump. If thats the case those other 2-3mpg are going strait into your oil. Sometimes it will throw up an air fuel code , but sometimes the SES light wont even come on.

That'd be obvious on the dipstick right? Should smell a bit like #2 right?

I'm now getting even worse :mad: . I pulled 18K home from Denver this weekend and got 7.5mpg :mad: :mad: :mad:. I've never seen less than 10.5mpg even pulling 20K. I was running a hotter EFI tow tune but I should be getting a little better with it than stock. Need top figured it out asap!

I blame the crappy milage on ULSD and winter fuel. I lost 100km per tank since fall and on the last fill I filled with purple off road fuel. Its low sulpher not ULS and guess what, 75km more for the tankfull. Same driving conditions and temps. Too bad they didn't charge half price for the crap.

That's BS that they are doing that to us. Tempts me to run off-road at home cause we have it in bulk and there is no DOT locally :D . Still not real safe though :rolleyes: .

When it got cold down here a couple weeks ago (20's in the morning) I lost about 1.5mpg's. I chalked that up to the engine having to warm up before it runs efficiently. When the temp's got back into the 50's in the morning and 70 by mid day, my mpg's were better than ever, I got 19. So it could be the cold weather or the winter diesel. That is my guess.

I am guessing a combination of cold weather, winter fuel, ULSD, hot tune, and maybe headwind on (I'm guessing I76) all conspired to dump your milage. That load does stick up a bit. Where in NE do you hail from? I am originally from Sidney.

I am guessing a combination of cold weather, winter fuel, ULSD, hot tune, and maybe headwind on (I'm guessing I76) all conspired to dump your milage. That load does stick up a bit. Where in NE do you hail from? I am originally from Sidney.

I'm 140 north of Sidney {east of Alliance}. I was on I25 and I80 and there could have been some headwind,couldn't tell though :D thanks to EFI.