Well, it wasn't as much of a success as I would have liked. I'm sure most of it had to do with driving conditions. On the same trip last week, it was dry with a slight tailwind = ~ 32 mpg. On my trip down today, it was raining with a headwind = 33.3 mpg.
I can definitely tell the difference in aerodynamics on his car, though. The difference between 55 mph and 65 mph is VERY significant. Greater than 10% according to the instant fuel gauge.
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