Jack211...

My engines don't seem to get less milage with the 30%. In fact when I was using 15% I had to use full throttle more which resulted in less milage. So...maybe they burn 30% faster but you don't need as much throttle because of the extra power. Maybe a wash?

The velocity stack sounds intriging. Do you have any power loss, more/less? Any disadvantages?

I'm going to search Horizons site and see if I can see one. Is yours for 100 or 82?

Thanks
Barry