JJ: A Fuel/KM Question

[JJ]

An automatic car gives good fuel average on highways then in city. suppose if a car travels 10km to a litre on highway, how much Km it will travel if you put your car in D and you dont press the pedel(speed about 6 to 8km p/hr).

[FLi_GTi]

Hmm..
Question has a lotta variables. Closet would be an estimation of static fuel consumptio. An average 1.3 consumes about .4 to .6 ltrs.

[FLi_GTi]

thats Per hour.

[JJ]

today i was travlling in civic exi auto, i asked the guy who was driving , How much does it gives in a Ltr, he said around 11km. then i asked him how much if you just keep it in D and dont press the pedel, he did not know...

[FLi_GTi]

Like i said, alotta variables, Load, temperature, gradient, drivetrain losses yadda yadda yadda, so on and so forth. Different foe very test i guess.

[Cool_Blue]

I cant understand the Question... You have said.. "how much Km it will travel if you put your car in D and you dont press the pedel".. How much Km in HOW MUCH FUEL?? What do you want to ask??

[Cool_Blue]

Sorry, i didnt read it right.. you asked how many kms in one liter... Well, if u dont press the pedal, the car will run in the first gear only, and wont cover more than 4-5 km.. in one liter

[JJ]

How much Kms it will travel in 1 ltr of fuel if the car is in D. no foot on pedel..
talking about an average car which gives 12 kms in 1 ltr on highway

[ustaad_007]

I under stand what you are saying, I think a car will give a worst average because when we are driving a car there is a momentum which helps the car to acclerete easily and shifts only 4th and 5th, which results good average, now if we dont accelerate the car , the engine is using its full potential to move the car, thats why it will result a worst average.

[ziaullah]

Well, since the car will be idling all the time its consumption will be high cos idle is not optiman operating point of and engine. There will be no or nigligible aerodynamic drag which is a plus point but mechenical friction will be same or little higher because the first gear is engaged all the which is less efficient due to higher gear ratio. I think 4-5 km/lit is a good guess by cool blue

[system]

JJ. One question. Y do u want to know how much it will consume in such a scenario anyway?

[JJ]

Mehran bhai.. few day back a friend picked me from my house in EXi Auto, he asked me where is the nearst petrol pump, i said about 2 kms. then he put his car in D and did not press the pedel, which looked odd to me, i told him it wont give a good milage. would ask it on PW and got the correct answer .

[575maranello]

asdasdasda

[whiteangel]

Most cars' fuel efficiency peaks at speeds between 70-80km/hr. Any slower and the engine has to work harder to push the car. If you go faster, too much drag will lead to more fuel consumption.

At a speed of 6-8km/hr the car might use less fuel because you are not pressing the pedal, but it will also take longer to reach its destination, so fuel consumption will be actually higher for the duration it takes to reach its destination. Also the engine will be working harder since the car is hardly moving.

If you drive at a normal speed and shift at proper RPMs you will get there sooner and hence consumer less fuel.