hey guys
Just got back from my 1st trip in my 'new' 94 cummins!!! so much better than my 95 gas dodge!! Pulled my 20-24 ft landscape trailer with light furniture on it from ohio to NY (420 miles) this past weekend. Pulled it back empty, & figured I got a dismal 15 mpg on the way back. Anyone know what size fuel tank I have? I've looked lots of places & books but can't seem to find it. The truck is a reg cab 2wd with automatic. The tranny seems like it has a final highway gear or covnverter maybe? on the road, but if I get into it slightly it kicks down/ out of it into a lower gear of sorts.
Anyways, I have 3.55's & 265/75/16's on it. Was pushing 1900 RPM @ 70 mph. 72-75 mph put me at 2100 rpm, so I stayed at 70 most all the way. I would like to maybe put 315's on it, but can't find anything NON-off road in this size. I'll be doing a fair amt of highway traveling, & am looking for highway style tires & something to get my rpm's down. I would like to cruise at 70-75 for that long of a trip, but want to keep my rpm's down around 1700-1800. Any thoughts?? I may look into a lockup or triple disc converter in the future; anything simple that can help me until then?

 

You have a lockup convertor now, and you have a 35 Gallon tank FYI. I run 35's on my 4x4, but I think they would be too big for a 2wd truck without a lift. I'm doing 2100rpm at about 85mph, and at 80 I'm doing 1900 or so, so at 70 I'm around 1650 give or take a hundred rpm's. Where in NY are you? and fill out your signature so we can see what ya got.

 

I live in Ohio but am planning to move to Syracuse. I updated my signature 2 minutes ago; hopefully it will show up (hasn't yet)

 

there it is-signature is up-yay!

 

Your RPMs seem a little high , at 68 mph my rpms are about 1750 .
Pulling a 32 ' Airstream I get 15 mpg ,

 

35's would rub without a lift on a 2wd. Try 4.10 gears, lol, 60mph = 2000 rpms.

 

hooray! now my avatar is up too :-)

 

with the 265's I still have about 4" or more on each side (from side to side) & about 6" above the tire before it would hit the fenderwell

 

And to think that before I got my tranny rebuilt in my dually I wanted 4.10 gears... HA.

Now I hate driving the 2500 because its like.... really really slow .

 

3.55's seem to get the best millage with a narrow 33" tall tire. with that setup back in the LSD days we got 23 empty and 16-17 with a car/trailer that weighed about 5000-6000#