Yes mine definately does 220 to a full tank, never ever ever had more than 240 to a tank in the years i have owned the car and never once had the engine light come on. Mine does have 21bhp extra over standard which does not help.
BKS engine light means problem, dont let anyone tell you differently. Something needs fixing. You need to check the IMRC is working properly, remove the air box and the cover over the DIS pack. Look down the side of the inlet manifold, you will see a cable connected to a lever on the end of the manifold. When you start the engine this cable pulls the lever to switch the inlet runners then when you get to 5000rpm the cable is pushed and switches back. Check that the cable has not snapped off the end of the lever first, if it is ok then get some one to start the engine as you watch the cable, as it starts the cable should pull the lever. If not you have found your problem, the IMRC has had it (silver box on the bulkhead)