that's great...i'm happy for you. i just know in my truck you can here a definite difference in how the engine sounds when it runs with 2cyl added and when it doesnt run with 2cyl.
the typical diesel knock or what ever you would like to call it is much less and the engine feels smoother. it takes about 1/4 - 1/2 a tank of going from 2cyl to non 2cyl for it to start not running as good. i dont think i gain anything mileage wise but you cant tell me that its not helping the engine with the difference in performance. a smooth engine is a longer lasting engine.
Sound good to me!