Recall that when Jake does an engine he goes back and forth from dyno to real world again and again. And yes he drives the car home and back over a very well learned road and if the real world doesn't reflect the dyno he'll tune it again until he gets the best balance...even factors in fuel consumption.
I know from talking to him several years ago how many experiments he went through just trying to learn the real world results of various exhaust mods, intake mods, tuning parameters, etc on various sized engines. He spent months on the project between tuning, dyno, track and his "home course" for dozens of iterations trying to find the right combination that wouldn't just look good on a dyno printout.
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