davyboy,
Have you read through the
65+ efficiency mods yet? If not, read them. A lot of work has gone into them. They are proven.
(FYI, Frank's post above is an example of his sarcastic humor. HHO is junk science. The Tornado is a snake oil product. Lift kits and other means of increasing your vehicle height increase your effective drag area. Acetone has anecdotal evidence for it, but little hard science.)
Let me repeat my first recommendation: Go visit the
65+ efficiency mods. Afterwards, restart this discussion.