Mine were all 32 except for the driver's side front tire, it was 34 for some reason. I upped them all to 36 and two fill ups later noticed a consistent 0.5 to 1 mpg increase. And that was right before the temps started increasing, so I don't think that was influencing it much yet.

The ride was a tad stiffer over bumps, pot holes, etc. but no, no jitters.

I don't know if I'd do 45, I am pretty sure (if I remember correctly) thats what my tires say is the maximum pressure they can take. Also, you put too much in, your tires will wear weirdly.

 

First, check what's repairable before adding aftermarket parts. These trucks will get between 11-17 in the city in stock form. Winter gas drops it a little, long idle times, stop/start, etc.

1. Make sure the plenum isn't leaking.
2. change all fluids in drive line
3. Run MCCC or Seafoam or both
4. Do a full tune-up
5. Oil change
6. Try really good gas like Shell or Chevron with cleaners

Then take it for a good hard trip like 100+ miles. If nothing changes, you've got either a lemon or a huge foot. Probably not the former. You might also have the deathflash. That will drop mileage 1-2. Check for stickers saying "authorized software upgrade" on the pcm or radiator support. If so, get a Hypertech or Superchips. Gained me instant 1-3mpg. But seriously, a good tune-up and new oils help big time. Good luck.

 

I just changed my tranny with one from Dr. Evil and I do not know if it was a fluke or not but went from 13 to 16 back and forth to work. I am going to keep an eye on it but do know I dropped 300 rpms at 60.

 

I thought MPG = My Petro Guzzler..

 

it is worth figuring out the question:
if more air in my tires gives me more MPG at today's high fuel prices
how many miles less can my tires last than the typical 40,000 miles
and I still come out ahead saving money overall?

it is more accurate to ask the question:
how can I lower my cost per mile driven
than
how can I raise my MPG?

 

I was getting 10.5-10.9 MPG until I had my catalytic converter replaced along with the two O2 sensors. now I get 12.6 - 12.9 (city). I also had my transmission rebuilt and getting TC lock up at 40-42mpg in O/D.I am also in a all stock truck with the optional tire size of 265/75/16. 5.9L, 4x4, QC.

9MPG is a sign of a engine issue. Start with what you can afford, a tune up (plug, wires, and distributor cap), and air filter. I have researched CAI and found that the gains are very minimal if negative (driving style has a lot to do with it), but in general they do nothing. If you have a higher cfm flowing exhaust then a CAI will help it breathe, and a WOT gain will be found with the CAI.

Anyhow, keep your oil changed, use good stuff, and don't use FRAM oil filters, and don't get the gimmick add-ons. Like TB Spacers, oil aditives, fuel aditives, that resistor found on eBay, or anything that just seems to good to be true.

Yes, the RAM is a big fat road hog and requires constant care at because of their age and how parts just wear out.

Keep your tires up on pressure, tune it up, drive like a ganny, and make sure its 100% in mechanical shape.

Best of luck.

 

I run 42 psi in my 265's

I drive 55. If you can't don't whine about mpg.

You don't want a loud exhaust for you daily driver.

 

Just out of curiosity... You're old aren't you?

 

hey I'm old LOL..but I love the sound of a sweet V8.. wife gives me crap cause I turn down the stereo so I can hear the truck

 

I definitely think that the higher the air pressure the better the fuel economy-I have some Dueller A/T Revos and I have them at 60 psi they are rated for 80 lbs at max and I drive on the highway often and average 15 to 16 mpg-thats pretty good for a truck thats got 180,000 miles on it!