A recall was issued in August 2022 affecting 280,000 BMWs, for 'undetected EGR system leaks make cause thermal activity in the intake manifold', an issue which has been the subject of a previous recall. The recall work may have included new parts or a software upgrade, and if the dealer has not explained this to you already you have the right to ask them to explain what work has been carried out.

The recall was issued to counter the problem of a potential leak in the EGR cooler causing a fire risk, and it is possible that a change in software or parts has resulted in a change in the way the engine operates, potentially affecting your fuel consumption. However, we would say that a loss of 4mpg is a small price to pay to avoid a potential engine fire.