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So got to travel on the same road in very similar conditions (load, temperature, wind, etc). Once again using cruise control to take driver out of consideration.
Computer calculated MPG was 41.4 vs 38.7 last time, this is average over almost an hour (had to abandon test after ~50mi as we ran into construction zone with lower speed limit). 7% improvement.
Difference? A set of EVO vortex generators installed alone the roof trailing edge.
I am building the underbelly panels when it warms up.
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