Ok, if best BSFC is at 2500 rpm and 70% peak torque, then you want to average around that number when accelerating - lets call it the 2000-3000 rpm range. Fairly different than "less than 2500 rpm" and "barely touch the throttle" (which suggests low loads).
The BSFC graph would show the right answer. A Metro should be accelerated in the 2500 to 3500 rpm, 70% range.
Slow acceleration does not lead to best fuel economy.
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