Have a buddy who lives in the Keys... . lost his motorhome to a hurricane a couple years ago. Insurance bought him a new one... same brand, size, motor, trans. , etc... . apples-to-apples comparisson; the one that was destroyed was a 12V and the replacement an ISB. He is sorely disappointed in the new rig! Gets much less mileage, less performance (hp rating is the same!) and is far noisier. DC, give us what we want: the END of the ISB series... how about common-rail injection, 350hp, silent operation and 30mpg!!!!