Well I personally drive a manual transmission, but I've too chicken to turn off the engine, so that was kind of the genesis of the question. I should get some feedback on what I've been doing (for example if target speed is about 30, I accelerate to 36, shift to neutral, coast until I hit about 26-27, shift into 3rd, and accelerate back up to 36) when I fill up sometime soon (probably Sunday). Just on face, do you think that "engine on pulse and glide" like what I described there is more efficient than just chilling at 31 in 4th? This is a 5-speed 08 civic if specifics matter, though I'm more interested broadly.
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