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All other things being equal, an automobile with an automatic transmission will, under normal circumstances, get slightly worse mileage than a standard shifting auto, due mainly to the power losses inherent in an automatic transmission. However, it's very possible to drive a 'stick shift' roughly enough so that it's advantage is quickly eliminated.
Recent advances in automatic gearboxes allow them to eclipse the efficiency of standard gearboxes. Some reduce power loss by locking the torque converter so there is less slippage, some have continuously variable gearing (check out: http://cars.about.com/od/thingsyouneedtoknow/a/CVT.htm) and some manual gearboxes have electronically controlled shifting that blurs the distinction between standard and automatic.
What else can I help you with?
Why does a car use more petrol when it has a load on the roof?
Its answer is very simple that a car uses more petrol when it has to overcome more wind resistance.
Why does braking use petrol?
It doesn't. The engine uses petrol any time it is running, but not more when braking.
What type of transmission fluid for Jeep Cherokee Sport?
The auto uses Dextron. The manual uses 75w90 gear oil.
What type of gear oil for the trans 99 dodge ram 1500 half ton?
The transmission does not take gear oil. The auto uses ATF+4 and the manual uses manual trans fluid.
Why do A car uses more petrol when it is fitted with a roof rack?
Wind resistance.
What type of gear oil for the trans 1999 dodge ram 1500 half ton?
The trans does not use gear oil. The auto uses ATF+4 and the manual uses a special manual transmission lube.
What is the difference between petrol car and disel car?
The petrol one uses petrol, and, wait for it, the diesel one uses diesel!
In terms of friction why does a car use more petrol when it has a load on its roof?
It uses more petrol because of air resistance. Friction pulling the load on the roof which causes the car to use more petrol because of the weight it needs more energy to move around.
How does the bike auto gear shift system work and what are its advantages over manual gear shifting?
The bike auto gear shift system uses sensors to automatically change gears based on speed and engine RPM. Its advantages over manual gear shifting include smoother gear changes, improved fuel efficiency, and easier operation for riders.
What type of transmission fluid does a 1994 Jeep Cherokee with an Aisin trany take?
Automatic uses Dextron Manual uses 75w90 gear oil
What is a petrol car?
petrol is synonymous to gasoline. so a petrol car is a car that uses gasoline as its source of fuel.
Uses of petrol?
Fuel for cars
