"What is more fuel efficient for automatic cars, accelerating quickly or slowly? And what is generally peak torque for typical passanger cars and trucks? For manuals, quick and smooth acceleration is most efficient. I would expect that the same is true for modern automatics, but don’t know for sure. With my own automatic trans car, I notice no difference between the two, maybe a slight improvement with faster acceleration. In the past, a study was done comparing slow braking and acceleration with fast braking and acceleration, but they didn’t investigate fast acceleration with light braking. I’ve been accelerating quickly (but keeping RPM below 3500 where I suspect efficiency drops off) and adjusting my speed mostly with the accelerator (easing off earlier to provide a little extra safe following distance and keeping near the speedlimit to time traffic lights). I get pretty good gas mileage, between 26 and 30 MPG (mostly sub-urban highway driving during rush hour). Before I started accelerating more quickly I got about 26-27 pretty consistantly. Is the efficiency of slow acceleration just a myth?"
Find Reviews by Make: