High people, having probs with fuel consumption on the misses astra coupe se1. The engine appears to be running fine, no black smoke smooth tick over ect, but she is only getting around 220 miles per tank of fuel, where she was getting between 280-290. Only sign of anything wrong is the engine management light comes on every now and then (comes on for around 100miles and then goes out for around 150-200 miles) code is bank 1 lambda sensor. Any one had any similar problems, I will replace the Lambda sensor, does anyone think this is related to the high fuel consumption?????