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Like Robert mentioned above, you can eliminate the background charging of the Insight by installing a Calpod IMA disable switch.
Look on InsightCentral on how to do this. The mod is relatively easy to do, and, like Robert mentioned, save you cash on your fill ups.
It saved me about 3 mpg over the last 3/4 of a year or so.
As for coast downs, I am finding out that they are not so easy to get repeatable results while using my GPS, which stores readings every two seconds.
Metro's method of simply driving and measuring fuel consumption at a steady pace might be better.
Pick a road where you can drive faster, as this will show up the improvements of aero mods quicker than driving slower.
Jim.
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