I'm sorry fellas, I think that the constant 19 - 20 mpg's out of a V8 with twice the power and torque is well worth the dumping of the slant 6 hands down.
And THAT, my friend, it was sets slanters apart from you V-8 guys. You have to understand that there are different kinds of "car guys". Many of us slanters are quite content with a measly 100-200 hp. I don't race my Swinger (on the street or the track) and my little slant makes all of the power I need. It's also WAY more fun to drive and work on than a MODERN 150 hp car.
For you guys that need to wring every pony out of your motors and don't mind giving up a few mpgs, then by all means, stick with a V-8. Just try to understand that slanters have different priorities, which DON'T include going as fast as possible for the least amount of money. You have to admit, if everyone had the same size and type of engine, this hobby would be pretty boring.