How to better mpg on Detroit 60Series?

look into AFE for your air filters. i put one in my 94 White/GMC . yes they had that. service just like a K&N , oil and cleaner solutions are available. give them the numbers of your old and also have the dimensions of the cleaner. these filters are awesome.

 

A 12.7-430 is a dog under 1500 rpm. There is almost no power or torque. The engine will get better fuel mileage at 1650 rpm than 1400. I have had several, one with the same setup as yours, and 68 MPH was the sweet spot for fuel mileage. Usually 6.8 to 7.25.

 

HMMM, OK, this is my first one. It did better at lower speed when I first got it, but it had the above mentioned problems. Leaky charge air cooler, loose intake valves, and injector screws, dirty air filter. Hasn't been anything worth leaving town with since I got it out of shop. I had a C-15 before, wish I hadn't traded it off, but maybe since these things have been fixed I'll like it better. If I ever get to haul a load with it.

Dave

 

AFE, could you give web address? Thanks.

Dave

 

What truck was it in, sleeper, day cab, ect...?

 

Dave what kind of rig was the truck you traded in BTW we have A series 60 470 in A 2000 freightliner century 7.0mpg is on the dash readout at all times.

 

Google AFE filters, it will come up.

 

Every 12.7 I have ever been in, and I have driven quite a few, will drop off considerably on torque at 1450 rpms. They ar just programed that way.

It may be different for some, but my last 12.7 would get better fuel mileage at 71 than 67. The two 11.1 engines I owned were also better at fuel turning 1600.

This may not be true for all, and these were engines from the 90's. There may be changes in the newer engines that change all this, I just don't know.

I kept detailed fuel logs for every fuel up on the trucks I drove, and have hard facts that the above was true for me.

 

if you want 30 to 40 hp just drill return check valve, 5/16 and no afect,miles comsu, this is works i did in 5 trucks i hope help