I tried this technique to much benefit recently. The weather was unbearably hot, and I had to go some 200 miles at a stretch. I was forced to keep the AC on, and therefore EOC coasting was not possible. I just decided to 'micro-P&G' - get up to 80 kmph, let the car come back to 75 on DFCO, then add a gentle burst of power to push it back to 80, DFCO to 75, rinse and repeat.
I got 47, without shutting off engine at all, at a respectable speed of 80 kmph.
Since then this has become my fallback option if I cannot do EOC coasting. (the entire summer months are 'fallback', with some exceptions).
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