There are a few comments in here which are claiming manual is better for fuel economy.
IMHO, the way to get better mileage is
- Drive slow
- Accelerate gently
- Look ahead and coast to slower speed instead of breaking when you need to reduce speed
- If on a motorway, trust your cruise control
- Check you tire pressure EVERY TIME you refuel.
I have an eight year old six speed auto shifter 2 litre petrol engine car.
On motorways, with hard compound tires I have regularly managed 44mpg. With softer tires I have managed 40 mpg. And I think it's down to my driving style rather than the type of gearbox.
If I had a more modern car with seven or eight speed box and modern ECU, I am sure I'd able to achieve even better mileage than stated above. Also, I'd be going mad if I had to manually chose and shift between eight ratios !!!
It seems that outside of U.S., there is some kind of social stigma attached with automatic cars. One is either a MANual shifter xor a WOMANual shifter.
Several of my friends are strong proponents of manual gearboxes. When I ask them why... I don't get to hear much stuff about gear ratios, clutch best practices, torque. It's a plain "I don't like automatic" without much real information. This preference is purely without logic or reason.
One of my such friends I noticed drives a for miles without going above third gear in situations I would have easily been turning the engine a lot slower in fifth gear.
I think drivers who have to deal with icy conditions may have a case for preferring manuals. We don't have much snow/ice where we are... just lots of rain and in that situation I am usually more paranoid about the state of my tires rather than feeling less masculine about letting my gearbox shift on it's own.
I think modern automatic shifters are better for fuel economy (and general peace of mind) than manual ones.