Looking to improve mileage. I have a 99 Cummins with a 4 in. exhaust and a K&N air intake. I'm looking for a performance chip that will get more mileage along with HP. I Pull a 18 ft. boat up to 200 miles oneway a day and want all the mileage I can get. I've been looking at the Super Chip , but looking for advice. One other thing is that I would like to be able to adjust tier size and speed.

 

I cannot help u on the chips

But tire size will help, smaller tires will do better for keepin fuel consumption down in the city, on the highway, the larger tires will give u a lower number meanin a higher gearing on the highway, if you tow 200 miles a day, then that highway mileage should be assisted with slightly larger tires, Hopefully u have 3.55 gearing already which should put you at 70 mph at 2000 rpms with 285 size tires.. in my truck that equals to about 20-21 mpg...

PS welcome to DTR! Make sure and put ur ride your sig to facilitate in us helping you...

Best of luck in ur search..

Tx

 

I would buy an EDGE EZ, drive 60 mph or less, use max tire pressure....and keep boost below 10 psi on hwy. Get class E tires, if not already.
RJ

 

the truck has 410 gears and the tires are 285-70/16 which dose help some but I'm looking for. when I get the truck fuel was $.35 less than gas now it's the other way.

 

285/70 is NOT a common LT size tire. Are you sure they aren't 285/75??

A 265/75r16 tire is going to help your mpg.

The best way to increase mpg (aside from slowing down) is air up your tires to bone-crushing pressures. 55 rear, 65 front, empty---> towing should be 80r/70f.

With 4.10s, 60 mph is a good speed to run in OD. You should nail 20+ empty, no prob if the tires are aired up (overinflated).

jmo

 

The Edge EZ wont be able to recalibrate for tire sizes, but it will be your best bang for the buck as far as mileage, and power. If you HAVE to have that option then i guess superchips or hypertech are your only options.

Eric

 

I'd go with the Edge EZ for mileage, I picked up a solid 2.5mpg increase on the freeway cruising 65-70mph, with the added power!

 

One does have to consider that if this is done regulary, it will decrease tire life along with odd tire wear.

 

I'm not to fond of the high pressure idea. It sure does eat the center of the tread fast. I've found that if you run 50 PSI Front and 45 PSI Rear you get good tire life and good traction without the tire wear.

As for speed I try to cruise at 55 MPH as much as I can. But if traffic picks up and get busy I will pick up to speed limit. But out here we don't get heavy traffic to offen. I take my time and enjoy the ride of the Cummins... Why hurry... It only you fuel bill that goes up!

 

Im doin 55 front and 35 rear, but thats with oversized (285's) on the stock rim.. so at these pressures is where they have the most contact patch without wearing the edges/center..

The best way to increase milage is to install a stop under the gas pedal to keep your foot from going all the way down

 

"I take my time and enjoy the ride of the Cummins... Why hurry... It only you fuel bill that goes up!"

That's what I'm basically doing right now...leavin' early, kinda enjoying the drive time and riding in a super cool truck

 

Right On!

Only certain vehicle deserve to be raced on the highways... You guys know what I mean...

 

I was being somewhat facetious, fellas!

I was just pointing out that you can have more MPG if you're willing to sacrifice ride quality and tire life.

I rather replace tires, myself.

jlh

 

Now you tell us... Geez Hohn...

 

If you have the proper sized wheel and the tire to match it, a radial will not wear the center out using rated pressure. I run 80 all the way around, got 130k from the rear and 80k from the fronts this last set, and a lot of that was with a bad tie rod end. Many will disagree, but on trucks it is somewhat different than a car, running the max pressure is what the tire likes. Ride may suffer but the tire life and wear patterns will be better.