Has anyone here that has converted to these or another fuel injection from a carb noticed any DROP in fuel mileage? I have a friend who recently install a new FI Tech and lost from 11 down to 9 when he installed it on his 383 street cruiser. Now I know him well enough that he is very meticulous with his calculations. He says it starts, idles, runs better and has more power. He is taking it to a friend who is going to help with the tune up. I am advising a customer on a purchase and will install the system. Any real world experience here?