Does this advice apply to all cars?
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Transmissions are designed to shift based on demand. If you hit the gas hard, the transmission will shift later. Shifting later means higher rpm. Higher rpm, means more fuel burned (also getting to that rpm faster, means more fuel burned) …. Basically your car thinks “I need maximum power, right NOW!”, and it revs higher and faster to get this done, resulting in a lot more fuel being dumped into the engine to accomplish this… Over time, this adds up quite a bit.
Same phenomena happens if you change to manual shifting in an automatic. The car is optimized to shift efficiently… Shifting manually means you likely shift at higher revs , and you will burn more gas. I noticed this quite a bit, when I had my 350z… Enough that I stopped driving it in manual mode for everyday driving.
As far as your braking question… Only thing I can think of, is that you let your foot off the gas, so the car essentially ‘limps’ with low engine revs…?! Bevause there’s no “demand” from the accelerator. Vs braking harder means the revs were likely higher for longer… But this should be negligible in the scheme of things.
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