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There is some truth to that. For example, I never do P&G in traffic jams as that helps to stop up traffic and is extremely hard not to brake more. However, as traffic permits, I really do think it best to operate the engine as efficiently as possible. As long as you need the power and it wont be converted into brake heat, it doesn't significantly matter how long or in what matter you accelerate, but rather how efficiently the power is produced.
And concerning BSFC charts, it would be smart for dyno centers to offer to produce BSFC charts for vehicles they test. I bet it would cost a lot though.
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