December 7, 2011
Does a 6 speed manual save more gas compared to a 6 speed automatic?
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Filed under Gas Conservation FAQ by on Dec 7th, 2011. Comment. 
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Comments on Does a 6 speed manual save more gas compared to a 6 speed automatic?
That used to be the case a while ago but they have made some good improvements to automatics now that if they are both 6 speeds, it probably makes little difference. The biggest difference is that you can control the way you drive more in a manual but really if there’s a 3mpg difference, that’s not a whole lot of money monthly.
As a general rule manual transmissions are more fuel efficient than automatics. Due to being able to control the engine RPM’s.
Auto’s use more fuel than manuals due to increased power losses due to design. The gap between manual and auto has narrowed through the use of 6 speed and lock up final ratios.
The difference will depend on make and model but probably in the range of 5-10% more fuel for the auto.
In most countries the auto is also more expensive to purchase.
Some manufacturers and road tests quote the difference in mileage.
ALWAYS
It depends on the car.
Many modern automatic transmissions can be just as or more fuel efficient.
E:
http://autos.yahoo.com/lexus_is_250/
2008 Lexus IS 250 6-Speed Manual 2.5L V6 204HP 18/26 mpg
2008 Lexus IS 250 6-Speed Sequential 2.5L V6 204HP 21/29 mpg
The same Lexus gets better gas mileage with a semi-auto.
manuals do to the clutch but not like it used to be. automatic are getting close