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In the dark days of the 1960's when we had only a vacuum gauge (but high compression engines), we'd default to speed limit in our thinking -- upon entering a highway -- as it is ALWAYS easier to slow down than to accelerate, both in time and distance. Once cannot force a vehicle in the outside lane to evade or nail the brakes as you enter, roughly. (If they're speeding -- not always posted limit speed -- then F 'em). Otherwise, somewhere between 2/3-3/4 throttle if there was traffic, but a bit less if none. Those cars also had quite a linear progression to throttle travel. Rods and springs on some, cables on others. So the same does not work today but that one knows the same "approximate" points as to rate of acceleration.
Safety trumps a few tenths any day. A bad habit to establish, IMO, is a pre-determined acceleration strategy. One should be MUCH more involved with mirrors, signals and the condition of the shoulder ahead if it all goes tits up.
Best too fast than too slow. Familiarity breeds contempt, especially for commuters on the same route; beware. I see the local cretins enter the highways around here and then speed up as the norm. Dead wrong way to do it. One simply achieves cruise speed before the end of the ramp if traffic allows (so long as it isn't one those too short Okie ramps).
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