It has often been taken as a given that manual cars are more fuel-efficient than automatics, with automatics often disregarded as being overly heavy on fuel. But there have been some significant moves made to improve the technology in automatic vehicles. Have automatics caught up; are they even better than manuals now?
Fear not, the answers are here.
In the past, automatics only had three or four speeds, so the engine had to rev higher at each shift, and higher at motorway speeds.
However, advancements have been made with automatic transmissions, meaning automatics now have more gears. Most new cars have around eight gears now, which has helped to reduce fuel wastage. The move from four-speed to six- or eight-speed gears means around a six per cent fuel economy improvement. This is because you can avoid revving too highly before up-shifting.
A torque converter is a fuel-guzzling thing. Older automatic cars would be pretty fuel inefficient, as the torque converter would slip, wasting fuel.
Yet, modern torque converters are locked when the vehicle is at high speeds, preventing slippage. This means that if you drive mostly on the motorway, you will have less fuel wastage. Despite this, for urban inner city driving, you may find that an automatic still burns fuel at a slightly higher rate than a manual.
The transmission internals have been refined so that there is now reduced friction in the clutches, and electronically controlled transmissions now mean that integration between engine, transmissions and brake systems is much better. Electronic controls will change gear at the optimal point, something few manual drivers do.
This means that only a small amount of energy is lost through an automatic transmission – not enough to cause any noticeable difference to gas levels or your wallet.
Despite these improvements, torque transmissions are still a good deal heavier than manual gears. This extra weight can still mean more fuel usage in an automatic.
Ultimately, it is the way you drive your car that will have the biggest impact on efficiency.
It could be that if you drive an efficient manual car aggressively, you would get worse fuel economy than if you drove an inefficient automatic well. People tend to drive manuals more aggressively because, well, it’s just more fun.
These ways to cut your fuel costs outline how the way you drive can dramatically alter fuel economy.
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