I was reading that they sell hydrogen injection kits and they double to triple your mpg. Anyone know anything about them?

 

Complete, total, and utter bullshit. No exceptions.

Here's a long topic on my forum if you really want to read up on it:
Aaron's Homepage Forum - Hydrogen Fuel for Cars

Of course, queue up a thousand replies to this thread from people with little understanding of electronics, physics, and the inability to read a few white papers and studies.

 

So dont trust in any of the companies? because some do look legit.

 

Complete, utter and total bullshit. No exceptions.