Why does a manual transmission car get better mileage than the same make & model with automatic?
by 
debodun
ANSWERS: 2
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They don't necessarily...a co-worker and I drive the same make, model and year of car except his is a 5 speed and mine is automatic. I normally get 39.5 MPG and he gets around 33.5. It's all about how you drive it. Keep those engine RPMs down. Life aint a race.
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the answer is that with an automatic transmission, there is hydraulic slippage that occurs inside a part of the transmission called the torque converter. this slippage forces the engine to raise in RPM's by anywhere from 50 to 200 RPM's to make up for the slippage. this makes the difference in RPM's of the engine and transmission about a 1 to 1.15 ratio, the engine being the side that spins faster. since the engive has to go faster because of the slippage, it uses more fuel. in a manual transmission, there is no slippage. the flywheel and the transmission are connected mechanically once you drop the clutch. in other words, they both spin at a 1 to 1 ratio.
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