if i drove my car everyday i would probably fill up the tank once a month at the most. cant say where you can find meth, but try local chemical dealers.
do you use just regular alcohol in your tank? is there much of a difference between using alcohol and meth? how big is your tank? and once you have your car tuned for alcohol injections, you MUST always have it flowing right?
even if you walk on water, some will say that you cant swim...