I've read through some it. Take it with a grain salt. Anyone can post anything on the internet. Yes there are good points made... But he could really be getting 15, multiply by 2 for "correction factor", hide so called "correction factor", and call it 30 mpg all day long and only allow 30 mpg to be mentioned and talked about and soon enough everyone, even himself, will believe it really is 30 mpg...
Just saying.