That makes sense to me. I would guess he probably discovered through trial and error early on that he needed to be moving for any flux to be capacitated at all (!), and then discovered that the Flux Capacitor would only open a time aperture at or above 88 mph (142 km/h).
Of course, in our world, the reason a time traveler using a Flux Capacitor-based time machine would have to reach 88 mph is to make it look cooler on screen. Also, severe tire wear is apparently part of the process, making a DeLorean less than ideal, since it can only carry one full-size spare in its default configuration. I would have used a Volvo XC60 crossover, but they didn't have them in 1985.
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Of course, in our world, the reason a time traveler using a Flux Capacitor-based time machine would have to reach 88 mph is to make it look cooler on screen. Also, severe tire wear is apparently part of the process, making a DeLorean less than ideal, since it can only carry one full-size spare in its default configuration. I would have used a Volvo XC60 crossover, but they didn't have them in 1985.