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80% load acceleration is fairly quick in a performance oriented engine setup. My 4 cylinder Altima does 0-60 in about 7.5 to 8 seconds. I don't see much difference in mileage from a fairly broad rate of acceleration. Getting to speed quicker certainly uses more fuel in the shorter period of time, but then you are at speed and using a lot less fuel for a longer period of time.
Taking a very long time to get to speed in highest gear versus more throttle and less time is mostly a wash, generally speaking. I have tested that and it really makes very little difference. This is for a performance oriented power train combination, say something that breaks 0-60 in 9 seconds.
While that may be considered slow by today's standards in older times it was considered pretty quick. The 84 Civic CRX with the 1.3 engine was rated at something like 13.5 seconds while the 1.5 was under 10. Difference in mileage was close to 20 MPG in the real world if driven properly.
regards
Mech
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