real world mileage, diesel vs gas

holstein13 wrote:

chadk66 wrote:
Achieving better mileage comes from a combination of things. Altered injection timing is an important part of it. Also changing the amount of fuel at appropriate times to achieve maximum power output at the correct time. It's rather mind boggling actually

What about emissions and longevity? I'm assuming the changes to timing could have a negative effect on emissions and / or longevity. Otherwise, wouldn't every manufacturer do it?

emissions aren't an issue in ND. If u choose to abuse the power you can tear stuff up. If u mind your business and keep your foot out of it your fine. You aren't gonna do that with motorhome. But yes u can tear a truck up if your stupid lol

if manufactures could (actually) achieve 25% better fuel economy via a tune or injector swap THEY WOULD !

I always chuckle to myself we i hear people in campgrounds claim theyre getting 18 or 20 TOWING their travel trailers. sheesh !

chadk66 wrote:
Achieving better mileage comes from a combination of things. Altered injection timing is an important part of it. Also changing the amount of fuel at appropriate times to achieve maximum power output at the correct time. It's rather mind boggling actually

What about emissions and longevity? I'm assuming the changes to timing could have a negative effect on emissions and / or longevity. Otherwise, wouldn't every manufacturer do it?

mike brez wrote:
My 7.3 has chip,injectors,turbo,4inch straight pipe exhaust,HPOP some trans work. I haven't checked my mpg in 10 years with this truck but I think I was getting about 15 mpg. I'm also spinning 35 inch tires.

the 7.3 was just never an animal you could improve economy on much for some reason. Not like the 6.0. Or the cummins which is the easiest to help out

Achieving better mileage comes from a combination of things. Altered injection timing is an important part of it. Also changing the amount of fuel at appropriate times to achieve maximum power output at the correct time. It's rather mind boggling actually

If you are a diesel mechanic, then you should not hesitate to get the diesel. You already know the differences between a diesel vs gas and you can quickly, easily, and economically maintain and repair your diesel engine at your shop or employer's shop. BTW, where would you get your gasser serviced? I suppose you'd probably work on that as well, but it wouldn't be nearly as convenient for you.

Not to state the obvious here, but if you can improve your mileage even 10% from stock then it's inconceivable that any gasser would provide you better mileage given the same weight, design and speed characteristics as your diesel.

Finally, it's easy to increase gas mileage by 25% or more, just slow down by 15%. You don't even need to be a mechanic to do that. ;-)

OK, I know that's not what you meant. But I'd be very curious as to how you'd hope to achieve a 25% reduction in fuel consumption with modifications.

On edit: I read how you hope to increase mileage. Please let us know how that works out for you. Intuitively, I can't see that giving you a 25% increase in mileage with rigs our size and weight, but it might help some.

My 7.3 has chip,injectors,turbo,4inch straight pipe exhaust,HPOP some trans work. I haven't checked my mpg in 10 years with this truck but I think I was getting about 15 mpg. I'm also spinning 35 inch tires.

My assumption is based on what i have done with my own diesel pickups as well as my sons. The older cummins are actually pretty easy and cheap to get better mileage with. My son has a 1999 3/4 ton dodge that has a 5.9 in. When he first got it he was getting 12-14 pulling his 34' toyhauler. Of course he stuck a chip in it after a short while and started getting about 16. Then he decided to purchase 100hp injectors so we threw those in and he started getting 16-18 pulling it. Same thing happened to my 05' ford with a 6.0. Pulling my enclosed trailer it would get twelve constantly. Put a tuner in it and got 14-16 with it. No other mods. It's pretty amazing what they can do for mileage. I have a buddy that has an older cummins also. He went a little more nuts with his and went with bigger injectors yet and a bigger turbo. But then installed methanol injection. He gets mid twenties on the highway just cruising with no trailer. He doesn't pull anything but I'd guess it would be pretty surprising what he would get. Methanol is actually the best gain for the buck and it keeps the egt's down there when pulling a load on hills.

WILDEBILL308 wrote:

Ok I will bite. Tell me about how you are going to get 25% better mileage chipping a diesel pusher.
Bill

from snake oil & PURE BS !

chadk66 wrote:
the reason I want to talk mileage is because I'm pretty confident I can make the diesel produce 25% better mileage and far more power for a rather low price.

Ok I will bite. Tell me about how you are going to get 25% better mileage chipping a diesel pusher.
Bill