what have you guys done to become more fuel efficient

Ok then. Boxers or briefs? I wasn't going to ask, though, clearly boxers are lighter.

 

boxers are lighter then breifs. but there's also more material.

so both weigh the same.

 

Get your truck check for intake and exhaust leaks. Even a little bit of boost leak makes a big difference. 1200 rmp is a lil low for an acert your hurting your fuel mileage. You need to be between 1250 and 1290 for the best fuel mileage. And start using fppf fuel power.

 

For us, to get to view those numbers right now, we have to have it up on our Qualcomm screen... Tiny numbers, so hard for these old eyes to see. I just don't want to mess up our electrical system!

 

Lmfao well boxers catch more wind so I'm assuming he goes with briefs. Me I'm not aero at all so its #### kickers, boxers, and a big ole cowboy hat lol.

10-4. What I would recommend would be a transmission swap eventually. 10spds are a fleet tranny they're like a 9spd. Good for company drivers but don't have the versatility of a 13 or 18spd. With the low cruise rpms you're okay flatland by all means but you don't have any pulling power for the hills. 1200 is where most motors peak at torque wise. And torque drops off rapidly below 1200. So you lose your power and end up dropping a gear and burning a lot more fuel pulling the hill.

I get criticized for how I pull hills I hammer the ##### up the hill but even with a big motor and a brick for a truck I was averaging high 5s on a bad week low 6s on an average week. And cruised at 1450 which is 72 mph. I could pull my hills and get off them which is where a diesel burns most of its fuel. It only takes about 250 HP to move 80,000lbs gross in a dry van down the highway flatland no wind at 65mph. The hills are what hurt us for fuel.

As I said I changed and am pulling a bull rack now. My fuel economy is horrible I'll admit it, there's multiple reasons for that that I don't want to get into. Anyway...if you're going to cruise at those RPMS, and that speed at least if you had a 13spd. You drop half a gear pick up 150rpm and you'll be at 1350 to pull the hill instead of dropping a full gear. That right there could be a major pickup in fuel at the end of the year. Take into account the driver is the biggest effect. Sounds like you know how to drive for fuel milage. At least once you're up to speed. As one poster said take you're time getting up to speed and keep your foot out of it. Good comparison drive like you have an egg between you're foot and the throttle. Hey it works. Even I do that. Hey I don't want hamburger in my trailer. Its about being smooth and being smart about driving. Also get a spec sheet for the power curve on your motor it may help you understand it better. 1450 on my motor is recommended cruise that is about half way between peak torque and peak HP. Peak HP is 1550 1200 is peak torque and peak torque is maintained until 1550 then drops off substantially. Some say the best fuel is half way between peak hp and peak torque. I cannot confirm nor deny but it may be something to try.

Sometimes we have to experiment with things sometimes it costs us others it pays off big just have to take that risk occasionally. Ain't like it can hurt much. Also as one poster said. Might want to look into high flow mufflers or straights. Back pressure is the enemy of diesels. I will eventually have a set of 8" straights with an 8" y pipe to cut back pressure. Hell I could probably pick up half a mile per gallon just ripping the stock mufflers off my tractor and replacing them. All in time. I would say try what I and others have suggested first and move on from there when the time and money are right. That would be your best bet on getting it worked out. Good luck.

 

Oh some of you guys are funny. But, if anyone has any interest in these two articles, try checking these out. www.OverdriveOnline.com/smart-driving-6 and/or www.OverdriveOnline.com/smart-driving-22.

 

Did y'all forget my tips I posted 12 years ago on the OOIDA forum? Oh, nevermind.

A good driver beats cruise control any day of the week.

A real manifold pressure gauge is what you need, not some KR scan-a-ma-jiggy thing.

Gravity is free. And FAST too!