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Old 07-06-2011, 06:55 PM   #13 (permalink)
Master EcoModder
Join Date: Sep 2010
Location: Foothills near Denver
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RSX2fast4mpg - '02 Acura RSX Type S
90 day: 38.22 mpg (US)

bubbatrucker - '98 Chevrolet K1500
90 day: 18.1 mpg (US)
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Originally Posted by kach22i View Post
convert meters to feet
30 M = 98.43 FT

That's 5-6 car lengths which is a recommended minimum highway speed spacing, right?

I would have thought a much closer distance would be optimal, as drafting.

This "suction" he talks about must be something different.
That's definitely the sweet spot for me. I'm completely comfortable in the 75-100' range and you can hear and feel the difference in air flow over the car. You can watch the LOD drop and the MPG climb as soon as you crawl into the slipstream. I had a 77 mile stretch behind a semi once that averaged 48.8mpg at an average of 69mph. That included some bits over 80mph and some city-highway traffic around 60mph.

You don't have to get into the stupid-zone to get great mpg gains. All you need to do is enter into the disrupted airflow and low pressure zone and you make impressive gains.
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