Fuel economy?

[Toquita]

Hi guys!

I'm wondering, which is the best gearbox for fuel economy? 6, 10, 12, or 18 speed?

And what is a good miles/galon ratio?

Cheers!

[Nono54Fr]

. more speed = more able to use the right speed for the current load.
. ratio =/= ration.
. the higher the better.

[Toquita]

Thanks but you really didn't answer my questions.

. more speed = more able to use the right speed for the current load.

How would this translate to the number of gears?

I couldn't find any scientific evidence of which gearbox is the best for fuel consumption.

. the higher the better.~

Well, thanks Einstein, but it was implied that I was asking for numbers :P
I'm currently doing ~7mpg, I don't know how good (or bad) this ratio is.

[jasonharris2]

Originally posted by Toquinha - I Like'm Hairy:

Thanks but you really didn't answer my questions.

. more speed = more able to use the right speed for the current load.

How would this translate to the number of gears?

I couldn't find any scientific evidence of which gearbox is the best for fuel consumption.

. the higher the better.~

Well, thanks Einstein, but it was implied that I was asking for numbers :P
I'm currently doing ~7mpg, I don't know how good (or bad) this ratio is.

7mpg is good

[Toquita]

Thanks Jason!

If you don't mind me asking, which gearbox do you use?

[jasonharris2]

18 speed auto w900 625 hp

[Leetpandaz]

18 speed manual, realistic fuel consumption selected, 425hp Cummins. Get 4.5mpg flat out, 7.0 with cruise, 6.0 average.

[Soharuda]

The more gears you have the easier it is for your engine to stay in the economy range. Doesn’t require as much fuel to stay there.

Sure there’s more shifting involved but it’s much easier on the poor cylinders

[Nono54Fr]

Originally posted by Toquinha - I Like'm Hairy:

Thanks but you really didn't answer my questions.

I did but you didn't understood my answers.

Originally posted by Toquinha - I Like'm Hairy:

. more speed = more able to use the right speed for the current load.

How would this translate to the number of gears?

I couldn't find any scientific evidence of which gearbox is the best for fuel consumption.

Lower RPM = lower fuel consumption, right ? I mean, right ?

06 speeds @ 65MPH = 1800 RPM
10 speeds @ 65MPH = 1600 RPM
12 speeds @ 65MPH = 1400 RPM
18 speeds @ 65MPH = 1000 RPM

Lower RPM = lower fuel consumption, right ?

With a load of 20 tons @ 65 MPH and a 6-speeds gearbox, you can only use the 6th (@ 1800 RPM)
With a load of 20 tons @ 65 MPH and a 18-speeds gearbox, you can use the 16th, 17th or 18th (between 1000 and 1200 RPM)

Which gearbox is best ?

Originally posted by Toquinha - I Like'm Hairy:

. the higher the better.~

Well, thanks Einstein, but it was implied that I was asking for numbers :P
I'm currently doing ~7mpg, I don't know how good (or bad) this ratio is.

If I'm Einstein, you're Edison. You're not a daily driver with a fixed load every day of every week, your gas money is not a weekly allowance, you could fill your tank every 30miles, nobody will bat an eye. In short, if an exact number cannot be an answer, " higher is better " is.

[Toquita]

Originally posted by Leetpandaz:

18 speed manual, realistic fuel consumption selected, 425hp Cummins. Get 4.5mpg flat out, 7.0 with cruise, 6.0 average.

Thanks!

Originally posted by Soharuda:

The more gears you have the easier it is for your engine to stay in the economy range. Doesn’t require as much fuel to stay there.

Sure there’s more shifting involved but it’s much easier on the poor cylinders

Thanks!

[Toquita]

Originally posted by Nono54Fr:

I did but you didn't understood my answers.

I guess only you understood your answers hehehe

And it's "didn't understand", not "didn't understood", "Einstein" ;-)

Originally posted by Nono54Fr:

Lower RPM = lower fuel consumption, right ? I mean, right ?

06 speeds @ 65MPH = 1800 RPM
10 speeds @ 65MPH = 1600 RPM
12 speeds @ 65MPH = 1400 RPM
18 speeds @ 65MPH = 1000 RPM

Lower RPM = lower fuel consumption, right ?

It depends. RPM by itself is not a deciding factor for fuel consumption, but e.g. throttle*RPM, light or heavy loads, and if you're on a leveled plane (cruising or getting to speed) or doing an uphill battle.

For cruising, the general idea is that lower RPM is better, yes. But it also depends on the engine:

"The 2007 on-highway fuel economy gearing for Linehaul Applications (≤ 80,000 lbs) at 65
mph is 1400 rpm for ISX engines with a minimum of 1650 torque in the top 2 gears and
1500 rpm for all ISM engines."

https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf

Originally posted by Nono54Fr:

With a load of 20 tons @ 65 MPH and a 6-speeds gearbox, you can only use the 6th (@ 1800 RPM)
With a load of 20 tons @ 65 MPH and a 18-speeds gearbox, you can use the 16th, 17th or 18th (between 1000 and 1200 RPM)

Which gearbox is best ?

Have you actually verified this in game? Because the gearing ratio on a 6-speed gearbox makes it so that, when it 6th gear, you're able to cruise at 60 mph @1100-1200 RPM as evidenced in the following video: https://www.youtube.com/watch?v=H_3ZWd_j7-4

At 2000 RPM he's at 100 mph.

So at cruising speeds I don't think there's a difference. I may chose between a 10 and a 6 speed gearbox. I like H-shifting, but 18 gears seem a little overkill to me.

Originally posted by Nono54Fr:

If I'm Einstein, you're Edison.

"you didn't understood"

OK.

Originally posted by Nono54Fr:

You're not a daily driver with a fixed load every day of every week, your gas money is not a weekly allowance, you could fill your tank every 30miles, nobody will bat an eye. In short, if an exact number cannot be an answer, " higher is better " is.

It should be obvious that "higher is better", and replying with such in-your-nose comment is not only not helping anyone, it's also a downright waste of time for everybody. It's like if I asked "what is a good amount of money to earn in 7 days of work in ATS" and somebody replied "well herp derp, the more you earn, the better". Yeah, no kidding, "genius" :D How about you give me some numbers now so I can compare with how much I earned, and then we can talk.