Well, regardless of the dyno results, I bought one and do so for all my vehicles.

What I did was to install it without telling my wife, who primarily drives the TCH. This was so she wouldn't try to alter her driving habits. My observations were about a 1mpg better economy after two tanks now. What I don't know is what effect if any it would have if I tried to get better mileage over what the technique would yield alone. Give that current fuel prices rising my cost/benefit says it could be worth it especially given the fact that this is a reusable filter (saves $$).

Big Al
Georgetown, TX