Well gents, the gasoline method works great. I hit 4 ant hills with a healthy dose of gasoline and the ants seem to be non-existent now. Lighting the gas is not necessary (but probably fun) as I think its the fumes suffocating the little buggers that does the trick. I poured at least a quart into each hill.
I still have a half dozen hills to destroy but am real happy to have found an effective method.