Fuel mileage

[96 6.5 turbo crusty]

How many miles are most of you getting on a stock 6.5 turbo diesel between fuel ups I seem to be only getting around 200-250 miles no hauling just daily drive to and from work. My work is only a 30 minute drive to and from

 

[ak diesel driver]

350ish winter 400ish summer

 

[smokymtn65]

Burb holds 40 so. 650 ish on hwy

 

[Paveltolz]

16-18 mpg depending on how much fun I'm having. If I want to have ZERO fun and be a pain to everyone on the freeway I can get 21.

 

[Stoney]

Must be nice...I get around 11 to gallon with a 97' 3500 crew cab dually. She's got a quarter million on her but still..the milage sucks

 

[Will L.]

Must be nice...I get around 11 to gallon with a 97' 3500 crew cab dually. She's got a quarter million on her but still..the milage sucks

Something is going on there. My hummer how I have it set up and loaded is around 10,000lbs. 12.5” wide offroad big lug tires so a lot of drag there. I extended my roof height a few inches higher than the vertical windshield and then a roof rack using 2” pipe. So my wind resistance is huge. I actually ran most of a tank never going over 45mph and 50/50 hiway city driving, once.

My normal foot to the floor from every stoplight got me 10.5 mph, and when I drove at 80% throttle up to speed I would get 12.5mph. I had my fuel screw turned high and got a puff of smoke each time so I turned it down a hair and got to 13.25mph and I don’t get left behind when the light turns green. The one time mentioned above that I kept wind resistance and cruising rpm down by max at 45 mph resulting in 14.1mpg.
I later discovered the one piston top was hammered from the glowplug failure so that was costing some efficiency.

5.2516 final gear ratio on 37” tall tires -so on of the people that enjoy math more than me has to translate that.

But I really think if you are doing worse than hummer/hmmwv does, something is not right.

 

[Paveltolz]

Must be nice...I get around 11 to gallon with a 97' 3500 crew cab dually. She's got a quarter million on her but still..the milage sucks

Being a K1500, I'm a little lighter, my gearing is 3:73 with a smaller rubber contact patch. On the other end, I've got HO injectors and a bad IP which means I could be doing a little better. With this motor set up I have a big case of happy foot that doesn't help either.

 

[Will L.]

@Paveltolz
“happy foot”

 

[Twisted Steel Performance]

I have made many trips of 900miles one way to the same place every year, always filled up at the same place every trip, winter or summer...

Always got 17mpg until the last trip back home last fall..

I traded some coating work for a near new manual IP timing tool. I always suspected the timing was retarded..

I played with it for several hours and got it to where the motor sounded right..

A few days later drove home, during the trip I kept watching the fuel gauge, thinking it must have gone bad.. turns out it hadn't, I now average 22+ mpg in the 93 dually...

 

[ak diesel driver]

So what is it set at now? Where was it set at?

 

[Will L.]

That is awesome news. timing is HUGE. I bet if you ran 0-60 it would show up there also...

 

[Twisted Steel Performance]

LOL , a 5 speed dually and a old man driver...... but on a dyno maybe.

 

[96 6.5 turbo crusty]

Wondering if the transmission not going into or would cuase that much a mpg difference

 

[Twisted Steel Performance]

Wondering if the transmission not going into or would cuase that much a mpg difference

It would help us if you filled out your signature section with info on the truck, year mods, etc...

And yes, if it's not locking the converter the rpm's would be higher so more fuel..

 

[Twisted Steel Performance]

And a much better way to figure fuel usage would be fill it to the top, wright the mileage down, then when near empty fill it up again and figure the mpg...

 

[96 6.5 turbo crusty]

And a much better way to figure fuel usage would be fill it to the top, wright the mileage down, then when near empty fill it up again and figure the mpg...

I'm getting 250 miles to a full tank if my math is right 250 ÷34=7.35

 

[Stoney]

I've got 180 thermostats in...wonder if I'm not going into lock out cause not getting hot enough.

 

[Stoney]

And how do I get timing set?

 

[ak diesel driver]

Need to use a scanner that will set it

 

[Rodd]

I have made many trips of 900miles one way to the same place every year, always filled up at the same place every trip, winter or summer...

Always got 17mpg until the last trip back home last fall..

I traded some coating work for a near new manual IP timing tool. I always suspected the timing was retarded..

I played with it for several hours and got it to where the motor sounded right..

A few days later drove home, during the trip I kept watching the fuel gauge, thinking it must have gone bad.. turns out it hadn't, I now average 22+ mpg in the 93 dually...

Since I'm rebuilding my 95 dually should I consider going with a DS2 and scrap the pcm all together? That kind of fuel economy is crazy in in dually.