it doesn't matter how you accelerate as long as its followed by a good period of coasting.
Usually the harder I accelerate the longer I coast after. I have found no significant difference from using say 60% engine load to accelerate to cruising speed on highway than 80-90%.
in your case, if the parking lot is fairly short and you have to come to a stop early on again, I would use as little throttle as possible. But if you are accelerating on a long open road with no stops any time soon use as much throttle without inducing open loop enrichment (this varies with cars).
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