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- - MPG VS. SPEED (https://www.classadrivers.com/forum/owner-operators-forums/27571-mpg-vs-speed.html)

Quote:

Originally Posted by solo379

Quote:

Originally Posted by serbie

Spec's and speed will determine your mpg. Simple, easy fact.

Good post, Serbie! 8)

It's also important, how you get to that "speed", be gentle with that pedal, it's not a NASCAR!
Keep it steady, remember,"up and down", cost you money!

And that's exactly what I'm talking about. I see people @ my terminal.. bob tailing.. bringing the RPM'S to the limiter... THEY ARE IN THE YARD?!?!

I use just enough peddle to get the truck rolling.. when I can.. grab the next gear with lugging the hell out of the motor and do it again.. till I'm up to road speed.. then maintain that speed with as little peddle as possible.

Did allan post something???

It must be hard work to be so dumb allan but I admire your persistence. Typical super trucker who knows everything.... :roll:

There you go with your ad hom attacks again. Sorry, I'm not going to stoop to your level.

Again, I ask for you to participate in the debate, and counter my points. So far you've acted like a 13 year old kid.

anyways, until you bring up some valid points, I'm done here.

Quote:

Originally Posted by allan5oh

Quit crying allan and if you think I'm attacking you then that is sad. You tell me to offer valid points and to counter your points. Well you haven't made ANY, you just throw crap out in the air and hope some one catches it.

And it's about time your done here, it less garbage to sift through.

Don't waste your time Allan. I think most everyone on here agrees with you.

Quote:

Originally Posted by SteveBooth

Don't waste your time Allan. I think most everyone on here agrees with you.

That's just sad if you guys agree him 100%. I said it before that in some applications slowing down does save fuel, but in others it does not. How hard is that to understand.... seriously.

Quote:

Originally Posted by jegzus

Quote:

Originally Posted by SteveBooth

Don't waste your time Allan. I think most everyone on here agrees with you.

That's just sad if you guys agree him 100%. I said it before that in some applications slowing down does save fuel, but in others it does not. How hard is that to understand.... seriously.

and you completely failed to give a decent example, or even sound logic. You stated that you worked for a nascar team, and two different cars on two different tracks got the same fuel mileage. That doesn't even begin to apply to the real world.

If you think that a car/truck can get the same fuel mileage at 70 mph then at 60 mph, your a complete fucking moron. That's all there is to it. One truck, not two different trucks, ONE truck. Slow it down to 55 mph, and it will even get better fuel mileage. If it's geared incorrectly, you can drop it to 12th gear and still get better fuel mileage. I've tried this several times.

So what can you bring to the table other then your "stupid" comments? So far you've completely struck out.

Quote:

Originally Posted by jegzus

Quote:

Originally Posted by allan5oh

If I'm not right about this, counter my points, and refrain from ad hom attacks.

I have countered your weak points already there is nothing more that I need to counter. And if you think I'm attacking you, then you are definitely in the wrong profession.

You have offered nothing but your opinion and a reference to an article that you read somewhere and that is all. If going slower saves you fuel in your vehicles that is fine and dandy. But that is not always the case, just like in my 97' ford dually power stroke, i got better fuel mileage at 72 than I did from 60 up to 72. So hmmmm looks like you were right.

As I said get over yourself, you do not know everything. I know it's hard to believe being a trucker and everything but the sooner you realize that the better it will be for everyone.

Hmmm I have PERSONAL experience with getting better fuel mileage by going faster. Oh and here is the biggest thing in that brochure.....

Quote:

Originally Posted by Kenworth brochure Driver tips

Maintain optimal RPM for the specific engine. Each engine has a unique torque curve. Drivers should operate at the appropriate RPM to maintain speed
and maximize fuel economy as recommended by their engine manufacturer. This range is typically between 1,200 and 1,600 RPM’s.

So your saying that if in high gear my sweet spot is 65-68mph I should slow down and run below that to get the best fuel mileage??? In all that aerodynamic hog wash even they say to follow the ENGINE's manufactures recommendations for best fuel economy. So what now all knowing super trucker?

Quote:

Originally Posted by jegzus

Ah hah! Sweet spot is NOT where you get the best fuel mileage.

The sweet spot is the best compromise between fuel mileage and pulling ability.

Also, the sweet spot changes depending on the load of the engine. Notice that engine manufacturers recommend a higher cruise rpm for heavy haul applications. Do you think it will get better fuel mileage? No it will not, it's a compromise between mileage and gradability. The same can be applied to speed. You'll need more rpms to run at 75 then you would at 55.

Show me anywhere that states running slightly below or below the sweet spot will result in worse fuel mileage. I'm begging you.

And yes, if you slowed down, you would get better fuel mileage. Try doing a few repeatable tests, eliminating variation (temperature, weight, wind, driving habits, overfilling the tanks, always filling up at the same spot). You'll be surprised.[/i]