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Costing Vs Getting To Highest Gear


dilan_randika
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Hi Friends,

In an automatic transmission car, acceleration is required for gears to be up-shifted.

But when we are moving in no traffic lane, which may have slops too, if we drive slowly using car's momentum, the car might be in low gears but, does this save more fuel than we accelerate & get car to higher gear & reach the destination?

What's the best thing? and how does the same scenario go ahead with manual transmission car?

Thanks....

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Good god how much petrol are you trying to save?? Economy aside, one thing you will be if a huge pain-in-the-aśś to all the drivers behind you in the lane!! If you try this, stick to the left lane and put your hazard lights on, to warn the other motorists.

It's impractical to be so concerned about fuel economy and still reach your destination. Jokes aside, if it's that much of an issue for you, leave the car at home and take the bus.

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Just drive ??!! All this thinking is going to distract you from driving and you are going to have an accident !!!

Besides, I am pretty sure doing all this is not going to make a HUGE NOTICEABLE difference in fuel consumption. Your attempts at saving fuel might actually cost you more fuel.

Edited by iRage
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What's the best thing?

The best thing to save fuel is not to start the engine.

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It doesnt work that way.

to get the maximum fuel exonomy. while your cruising on a low gear with very less revs. jump out of the car.

when you car is on low gear the weight becomes a issue.

another good way is to but the car on drive (D) and while the torque converter push the car forward. get out and run behind it. This will also save you so much of fuel.

if its a manual transmission. always start with the 5th gear. . Veeery economical. Follow MasterDon's practice. remove the other gear. useless men. just wasting fuel. u know.

Bloody Thel higanno.

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It doesnt work that way.

to get the maximum fuel exonomy. while your cruising on a low gear with very less revs. jump out of the car.

when you car is on low gear the weight becomes a issue.

another good way is to but the car on drive (D) and while the torque converter push the car forward. get out and run behind it. This will also save you so much of fuel.

if its a manual transmission. always start with the 5th gear. . Veeery economical. Follow MasterDon's practice. remove the other gear. useless men. just wasting fuel. u know.

Bloody Thel higanno.

Or keep the butt off teh seat... that will help too. Dont put any weight on the seat. If your wife/GF is fat, get the bitch to diet. That will help. Most men who complain of bad fuel figures have fat wives/GFs... starve them bitches.

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Friends,

i'm somewhat new to this automatic transmission functionality & things that's why i wish to ask u experience people a such question.

transmission = auto

in my question, i assumed a condition like in a by road or a lane that we r not making any traffic jam & road is not in a proper condition that best suitable gears are 1,2 & if you do hard acceleration u can get into 3rd.

Question is instead of doing rapid acceleration to get into 3rd)or any higher) for a short time, if we let car to do all job in 1st & 2nd in cruising manner(not hurry to reach destination) keeping RPM <= 2000 & using the maximum momentum & let the cars weight itself roll it.....

1. So such driver would save more fuel than the one who aggressive(may go in higher gears, would finish journey quickly, more acceleration may be higher RPMs like 3000)?

2. An automatic transmission car would select the best suitable gear vehicle should be based on vagarious factors like load etc. why does still an auto car does bit less on km/l than it's same type manual?

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OH FFS...

Its a FREAKING AUTOMATIC, Just let it do its job. It changed the gears for you at the best possible moment so u dont have to worry.

If you are really this worried about fuel economy. SELL IT.. and buy a Manual

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Friends,

i'm somewhat new to this automatic transmission functionality & things that's why i wish to ask u experience people a such question.

transmission = auto

in my question, i assumed a condition like in a by road or a lane that we r not making any traffic jam & road is not in a proper condition that best suitable gears are 1,2 & if you do hard acceleration u can get into 3rd.

Question is instead of doing rapid acceleration to get into 3rd)or any higher) for a short time, if we let car to do all job in 1st & 2nd in cruising manner(not hurry to reach destination) keeping RPM <= 2000 & using the maximum momentum & let the cars weight itself roll it.....

1. So such driver would save more fuel than the one who aggressive(may go in higher gears, would finish journey quickly, more acceleration may be higher RPMs like 3000)?

2. An automatic transmission car would select the best suitable gear vehicle should be based on vagarious factors like load etc. why does still an auto car does bit less on km/l than it's same type manual?

1. Yes but only if the journey is short like 200m and you exclude the fuel consumed to get the initial momentum. During a continuous run the one who drives at a constant speed around 50 - 60 kmph saves more fuel than the one who drives below 30kmph or that being equal the one who is less aggressive on the pedal saves more.

2. The loss in the torque converter of AT (think why ATF gets so hot) and the predetermined criteria in engaging gears. In the case of MT you operate the clutch using your muscle power (does not consume fuel!) and also according to your own judgement to get the maximum efficiency (but it may not be the best criteria for the engine and the drive train, for example if you are in a higher gear than necessary all the mechanical components in the engine and the drive train would be under undue stress).

Hope this clarifies your point.

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1. So such driver would save more fuel than the one who aggressive(may go in higher gears, would finish journey quickly, more acceleration may be higher RPMs like 3000)?

YES, and it is OBVIOUS for any car irrespective of transmission. (aggressive acceleration and braking)

2. An automatic transmission car would select the best suitable gear vehicle should be based on vagarious factors like load etc. why does still an auto car does bit less on km/l than it's same type manual?

Not all automatics give less fuel economy than manul car. At least not when me and some of our forum members deside to take control over the machine and put our self in to test. Some times our manual cars very hungry on fuel than your auto.

Edited by MkX
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Oh for the love of koththu roti! Automatics were made for CONVENIENCE! Not ECONOMY!! For fat Americans who couldn't be bothereed about fuel economy and a clutch. Still, the cvt transmission can give better mileage figures than a normal four speed auto.

If you're so concerned about mileage,

1. Take the bus

2. Walk

3. Buy a manual car

4 buy a Nissan leaf

5. Buy a push-cycle

The stupidity of the answers you have received here is a direct reflection of the intelligence within the question asked. Hope that clarifies everything. if not,

Edited by Komisiripala
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....

in my question, i assumed a condition like in a by road or a lane that we r not making any traffic jam & road is not in a proper condition that best suitable gears are 1,2 & if you do hard acceleration u can get into 3rd.

Question is instead of doing rapid acceleration to get into 3rd)or any higher) for a short time, if we let car to do all job in 1st & 2nd in cruising manner(not hurry to reach destination) keeping RPM <= 2000 & using the maximum momentum & let the cars weight itself roll it.....

Well, jokes aside, I know everyone here knows this.., if you accelerate hard, 'kick down' will be activated and shifting could be delayed or downshifted, giving you more power. This is useful when you need more power such as during overtaking.
To quickly shift-up to the next gear for normal driving, you can slowly accelerate to critical point in RPM and push back the gas pedal little bit.
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@dilan_randika

what is this magic number 2000? higher gears are fuel efficient? aggressive driving consume more fuel??....

why fuel consumption for the same vehicle depends on driving patterns or driver.

Answer:

"fuel efficiency" is non other than fuel injection rate vs power.

i will just mention two theatrical points that you all know. you may build up practical explanation on top of that.

  1. Travel in constant speed also it consumes power. This power depends on the speed.

Ex: if 60kmph -> 10hp, then for 120kmph it might be 50hp.

  1. Vehicle has an unlimited number of torque vs RPM curves. For the simplicity you can assume that, there is a torque vs RPM curve for a given throttle position. Power vs RPM curve can be derived from Torque vs RPM curve.

At 1000 RPM, half throttle position might produce 30hp, but full throttle position might produce just 40hp. but the fuel injection rate might be few times higher than the half throttle position.

At 3000 half throttle - > 50hp

Full throttle -> 90hp (40hp extra power is worth for additional fuel injection rate, but in 1000 RPM it is not).

Edited by MV-5
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