its pure bunk.
This guy is nuts. He thinks its some great conspiracy, but its not.

 

I would like to increase my efficiency by 50% , what exactly did you add, subtract or modify to achive this?
I remember quite a while ago I changed my exhaust system and nearly doubled my mileage, but then remembered I had forgotten to reset the trip counter the previous time I had filled up. I am not saying you did this, or even that friends are playing a joke on you by adding fuel to your tank a little at a time with jerry cans. (however in that case you would be saving a lot of money) but it seems incredible.