Not to mention the WB's come online pretty quickly, usually well under 1min so new cars could go into closed loop fuel control much quicker even if they're still in warm up fueling mode. Ours cars only go into C/L based on coolant temp which is usually programmed to happen in the 120-135 degree range which can be an easy 4-5 mins depending on ambient conditions during which the car is running off of hard coded warmup fuel parameters in the chip. Anyway you slice it having a WB and knowing what your fueling is actually doing is very, nice don't think I'd want to do w/o one now.