Well I tried the sawzall and it cuts, but would have taken about a week. Advice for those wanting to cut asphalt.... rent a concrete cutting saw like I did and it is easy work. Unless you have a lot of cutting to do the disposable abrasive blades work well and at $6 bucks a piece you can buy almost ten for the price of one diamond saw.
Anyway I cut the asphalt and then used a iron breaker bar to bust it up. I have nice clean lines.
The man who makes no mistakes does not usually make anything. ~Edward Phelps