Quote:
Originally Posted by bikenfool
For most cars, when cruising we're at low throttle opening, either backing off, or constant throttle doesn't get the engine close to peak efficiency.
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Peak engine efficiency isn't the same as best cruising fuel economy.
Peak efficiency on a BSFC map shows at what load & RPM your engine makes the most power/torque per unit of fuel burned. It's usually when making a lot of power, which is why it's applicable to accelerating and using the pulse & glide technique.
But it's not applicable when cruising in top gear because your power requirement then is a small fraction of power needed for accelerating (or climbing).
So you have to operate the engine outside of the "ideal" BSFC zone.