The proper measure of fuel economy is the energy generated referenaced to the fuel used, most the worl use grams of fuel burnt per Kw generated per hour.....
I have tested cars at a steady 30/40/50 etc, and 30 was the most economical and that was at about 1500rpm with a 1.4 litre engine (that just happes to be the car we were testing).
Peak torque is just where (there or there abouts) it can pump most air per cycle, efficient as an air pump, not necesarily for economy!
Simon
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98 S-turbo, next mod decat D/P and hybrid turbo!
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