Car drives fine,no dashboard warning lights etc.But noticed my MPG worsened for last few month.Far too many trips to petrol station. Don't think my driving style changed,but its mainly London traffic and spirutual driving. I may suspect that my MAF is dirty and may need cleaning!!? Will that make a difference? Will I need to reset ECU after that? What is the general view on cleaning MAF and throttle body on 350z?