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This is a x-post from Prius C bad highway MPG thread:
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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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Prius C computer collects the MPG data on monthly basis, and the data collected in past 4 month seem to confirm the trend, though they are too imprecise to use in calculations. Since car gets ~2,300-3,000mi a month, this is result of ~11k worth of miles.
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