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09-12-2006, 03:23 Pm
Excellent weather today (little wind), so took a couple of hours off and did 6 bi-directional runs @ 90 km/h (56 mph).
3 with, 3 without the undertray .
57.78 mpg (US) - with undertray
56.55 mpg (US) - without undertray
1.23 mpg difference, or 2.2% increase with tray
Not really happy with the results. It was a lot of work for such a small gain. But them's the numbers.
A question for the aero enthusiasts: my car rides quite high off the ground - 6 inches or maybe slightly more. Would an undertray help more on a lower vehicle (like the A4, which probably has 3 or 4 inches of clearance)?
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