Eco tunes for unladen long distance highway mpg's

KingRanch6.4 · Apr 30, 2014

Was reading some older posts about trying to find an eco tune for low rpm shifts/lockup and better highway econ. I am running Gearhead's race tune for spirited daily driving and love it, but on my long highway trips I would like to get back to those 25-30 mpgs (dash calc'd) I used to get with a preloaded 6.4 tune on my SCT Livewire TS programmer.

Has any one mastered this? Matt himself perhaps? Sorry if it's already covered... Newb here.

drunk on diesel · Apr 30, 2014

those dash calc'd numbers were way off

Derkperk · Apr 30, 2014

What do you mean? I can see 30 on there too?? LOL
If you are cruising highways, you should be locked up and making minimal boost. The best results I have found is my hottest tune. My extreme x from Eric will get me 18-18.5, hand calc, doing 75. Just go easy on the on ramps. This is with my 6.0 but not sure why that would matter.

johnp115 · Apr 30, 2014

I stay on race tune it works best for me.

They dash is way off

Even if mine says 21 when I'm on the highway I hand calculate it and I actually get 18ish hwy

johnp115 · Apr 30, 2014

Derkperk said:
What do you mean? I can see 30 on there too?? LOL .

LOL yeah just reset that bitch when you're going down a hill... You'll get 40-60mpg!!!

3brorce · Apr 30, 2014

My dash is pretty dang right on at 14.4.

drunk on diesel · Apr 30, 2014

Derkperk said:
What do you mean? I can see 30 on there too?? LOL
If you are cruising highways, you should be locked up and making minimal boost. The best results I have found is my hottest tune. My extreme x from Eric will get me 18-18.5, hand calc, doing 75. Just go easy on the on ramps. This is with my 6.0 but not sure why that would matter.

honestly couldn't tell you why, but 6.4's seem to be 1-2mpg off of a similarly config'd 6.0

Derkperk · Apr 30, 2014

Oh for sure. I get the mileage difference between the 2 engines but guessing the hot tune theory is the same.

drunk on diesel · Apr 30, 2014

definitely, and Matt has an eco trans tune that locks early. might be worth a try for the OP

Stroked777 · Apr 30, 2014

I don't mean to derail but before I did my stud/cam work my dash use to say 18 mpg around town all day. Now it reads 14.5-15 mpg. Anyone else experience this?

TXlineman83 · Apr 30, 2014

Stroked777 said:
I don't mean to derail but before I did my stud/cam work my dash use to say 18 mpg around town all day. Now it reads 14.5-15 mpg. Anyone else experience this?

Perhaps the go pedal gets used a little more. Lol.

Stroked777 · Apr 30, 2014

TXlineman83 said:
Perhaps the go pedal gets used a little more. Lol.

even when i drive conservatively

TXlineman83 · Apr 30, 2014

Stroked777 said:
even when i drive conservatively

I was joking. Changing the cam could significantly affect MPGS. Seriously depends on a lot of factors.

capt dong · Apr 30, 2014

6.0 prolly gets better fuel eco on just smaller displacement alone.

johnp115 · Apr 30, 2014

Honestly just find a tractor trailer that's hauling ass and stay behind him. I love drafting them. Major difference in mpgs. Practically no wind drag.

KingRanch6.4 · Apr 30, 2014

johnp115 said:
Honestly just find a tractor trailer that's hauling ass and stay behind him. I love drafting them. Major difference in mpgs. Practically no wind drag.

This Mishimoto CAC and Rad are too purdy to be following rigs around eating their rooster tails of flack off the hwy.