My parents drive my vehicles occasionally, and they probably get 15% less FE than me. My dad likes to accelerate up until he is stopping (no coast) and revs the engine way higher than it needs to be, even though he isn't accelerating hard.
It kills me to be a passenger for this very reason. I see how inefficiently everyone else is, and it drives me crazy.
My sister is by far the worst. She jumps into a cold car and just hammers the peddle, and doesn't anticipate anything. She barely watches the road enough to avoid accidents (most of the time).
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