You are not doing much good too putting "Insight" on the title when no batteries issues have been reported with the Insight!
Don't really know this Clark Howard (just seen his site after searching with Google), but I suppose he's referring to the Civic, right?
Anyway, it should be noted that it will probably take some times to verify this claims, because there are also users that haven't noted any changes, some that have seen better milieage, and so on.