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Generally, IMO, is that gas/petrol engines should be accelerated at just below "open loop", which is right around 75% throttle. You want to keep the oxygen sensor in the fuel control loop - closed loop. This is for open country where there is distance between stops. Stop and go traffic should be easy throttle between stop lights. When the gasoline engine has to work hard, like accelerating, generally the least fuel used is a peak torque.
Diesels are another story. It will take some practice to see what works best. Generally, one ought to shift around 1200 rpm, then shift at around 1700 for the last gear. This is my opinion, not hard and true statement for everything.
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