LMM how to drive it for fuel economy

[mario430]

Not sure if this is in the right area but here's my stupid question.

Is it better the slowly creap up to driving speeds (shifting at 1700-900 rpm) where you can barely hear the turbo kick in or would it be better to drive it a little harder to where your hearing the turbo kick in and get up to speed faster. Ideally normal driving where should my RPM be when its shifting for best fuel economy.

Sorry for the silly question but I am new to diesels and I love it but if I can get better fuel economy it would be even better.

2008 LMM sierra 134K CC/SB

 

[BudTX]

The DIC display can help you find the most efficient method. I suspect that the most efficient will be a gradual acceleration at lower RPMs.

 

[bevi]

City or highway? What are you averaging right now?

 

[Petty Cash]

My LMM typically shifts around 1800 or about 2K-2200 if I'm accelerating up a hill. My LB7 is generally closer to 2K or 2500 up hill.

 

[Muff]

Hold the fuel pedal to the floor until you reach desired speed. :thumb:

 

[mario430]

City or highway? What are you averaging right now?

70% expressway rest city and driving slowly up to speed I'm averaging 15.4 with me doing the math but the cluster is saying 18.6

 

[mario430]

My LMM typically shifts around 1800 or about 2K-2200 if I'm accelerating up a hill. My LB7 is generally closer to 2K or 2500 up hill.

What kind of fuel economy are you getting?

 

[Petty Cash]

What kind of fuel economy are you getting?

The LMM is around 14-15 driving back and forth to work on country two lanes with a ton of idling on winter fuel. With your 70/30 Highway/city split I'd be in the neighborhood of 16-17 MPG, based on similar trips I've taken. That's with my tuning though.

My LB7 has been around 20-21 highway running around Ohio. Around here it's always been closer to 16/19 city/highway.

 

[Dozerboy]

For a stock truck Mario your mileage sounds pretty good.

 

[mario430]

I don't know if this helps or hurts but I do have a K&N air filter in the stock box. What would be recommended to help improve fuel economy on my truck? I'd love to see in the High teens or low twenty's.

 

[Petty Cash]

A good tune is probably the best bang for your buck. You won't go wrong with any of the respected tuners. If a canned tune is more what you're after, I'd suggest looking at PPE.

 

[mario430]

A good tune is probably the best bang for your buck. You won't go wrong with any of the respected tuners. If a canned tune is more what you're after, I'd suggest looking at PPE.

I will be 100% honest I know nothing and when I say nothing I mean nothing in regards to tuners I would just like better fuel economy. My big thing is my truck is a daily driver and I don't want to do anything to hurt engine or my Allison. So any recommendations are welcome and appreciated. Heck I'd love to meet up with someone in Phoenix and have them look over the truck and see if they have any additional recommendations.

 

[Dozerboy]

By a used tuner for cheap IMO a PPE or a Predator. You have to find one that will delete the emissions stuff. If you want a good increase and then you need a aftermarket exhaust.


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[Big Block 88]

I would drive aggressively through a rough field or pature and try and tare off the dpf and then tune for delete...

 

[bevi]

I would drive aggressively through a rough field or pature and try and tare off the dpf and then tune for delete...

Yes I like how you think!

 

[newguy2006]

Ok yes another new guy what is a dpf


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[duramaxdiesel]

Yeah get rid of the DPF and call Steve @ SS Diesel Tuning. He's your neighbor. I have two LB7's and my LMM. I'm dying to see what my mileage is now that the DPF is gone.

 

[Big Block 88]

Ok yes another new guy what is a dpf


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If you had an lmm you would know lmm up are the only ones that need to worry about it.

Dpf diesel particulate filter emissions bs. Good for nothing other than collecting dust in the garage.

Search function in this site will take you from new guy to a semi expert ifnyou use it properly

 

[Dirtymaxx03]

Get yourself an egt gauge.

When you accelerate watch the gauge and keep the temps as low as possible. The more fuel you're burning the higher the egts.

 

[DirtyMax32]

I have a ppe HOT+ 2 E.T. 10 stage tuner for sale. Fits 01-10. PM me if you're interested.

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