I've just started using Pre-MIX in my 13B-MSP. Smoother feel almost immediate after the 1st fill-up. I'm putting in bout 200ml (believe it's a US quart) for every 50 litre tank.
Like lennon said RM 60 for a 1 litre bottle to last 5 fill-ups.
I don't know about you guys, but I love it when toy companies like Hot Wheels produce real derivable cars. For their latest creation, Hot Wheels turned an X-Wing into a car of Star Wars' enthusiasts' dream.