There is a ton of false information out there. Some of it is misguided, and some of it is just left over from when vehicles were made in a different way to completely different regulations. This new post format is going to pose these questions to our top tier technicians to find out once and for all if they are FACT or MYTH.
There has been an unspoken agreement for decades that manual transmission cars get better fuel economy than automatics. The argument being that when the driver is in control of all variable related to gear changes and situational driving he is more effective than the preset gear ratios of an automatic transmission. The question is, though, with all of the advancements in vehicles in the last half century, is this still true? Lets look at this and some other stick shift myths below.
Manual Transmission gets better fuel economy?
Once upon a time, probably yes. Today? Not so much. In the past it was pretty much a given that vehicles with manual transmissions would be more fuel-efficient than their automatic counterparts. But as automatics become more advanced and gained additional gears, they have now overtaken manuals in terms of fuel economy.
You can grab many examples from the spec sheets of modern cars, here is one from Ford:
- The 2014 Ford Focus offers a six-speed automatic version that performs very well, getting 33 mpg combined (28 city/40 highway) versus 30 mpg combined (26 city/36 highway) for the manual transmission.
If automatics are equal or better now, what has changed?
The reason manual transmissions used to get better mileage is because you put the car in the gear, take your foot off the clutch, and the car is “locked” in that gear until you remove it. This is why a car with a manual transmission will stall if you come to a stop without taking it out of gear. Automatics of old used a viscous, fluid coupling, which allowed the transmission to “slip” when you’re stopped at a light, to prevent the engine from stalling. BUT, that same fluid coupling that allowed the transmission to slip at low speeds was harming mileage at higher speeds.
Today’s automatic transmissions have some new tech that fixed these inefficiencies. The lock-up torque converter solved this problem by, essentially, allowing an automatic transmission to “lock” into gear (automatically) at higher speeds, like a manual transmission would — and then unlock when you slow down and need a traditional automatic transmission again. When you add this development to constantly variable transmissions (CVTs) that use pulleys to constantly adjust the gear ratio, giving them, theoretically, an infinite number of gears, you get exceptional fuel economy with no intervention from the driver.
Beyond these points, and with fuel economy numbers being all but equal between the two transmission types, it just becomes a matter of taste. Find the car that best suits your driving style and you can trust the fuel economy will be almost identical in a new vehicle.