The phrase "accelerate gently" is correct and usable in written English.
It can be used in contexts related to driving, machinery, or any situation where a gradual increase in speed is advised.
Example: "When approaching the intersection, make sure to accelerate gently to maintain control of the vehicle."
Alternatives: "increase speed gradually" or "speed up softly."
The hypermiling technique which this method refers to is called "pulse and glide .It involves accelerating gently up to a speed that is slightly higher than that which the driver wants to average (the pulse), and then taking your foot off the accelerator while leaving the car in a high gear (the glide) until the speed falls to slightly below the average.
Accelerating gently in the "Drive" rather than "Sport" setting of the six-speed dual-clutch automatic transmission, the R-Line bats the revs down to 1,500rpm.
"They think that the way to get best fuel economy is to accelerate very gently, but that proves not to be the case.
Brake sooner than usual and more softly, accelerate more gently and for longer.
Nasa's Dawn probe has now left Vesta, its ion thrusters accelerating it gently towards the dwarf planet Ceres.
People saved the most gasoline when they pushed down on the accelerator briskly and then shifted quickly, keeping the revolutions per minute low -- not by accelerating very gently.
One particularly memorable feature of the Los Angeles press drive was the "Fuel Economy Challenge," in which automotive journalists who ordinarily prefer to drive over 100 mph on a track could be seen attempting to maximize their mileage by puttering around Culver City at 15 mph, braking and accelerating as gently as possible and enthusiastically checking their average fuel economy readouts.
If you must drive, choose a fuel-efficient vehicle and drive to save gas and emissions — stick to the speed limit, keep your tires properly inflated, empty your trunk of heavy items, and accelerate and brake gently for better fuel efficiency.
For example, if the back end of your car starts to slide in a vehicle with FWD, turn the front wheels the direction you want to go and gently accelerate to pull the car out of the slide.
In official tests, cars are gently accelerated to 30mph (50kph) and then slowed down several times on rollers in a laboratory.
