Hi,
Wife has v36 sedan as a family car. We love it, well built and sturdy for the kids. K&N air filters but it pings a bit in summer on hot days. We always run BP 98.
Only downside is the fuel economy, which is felt even more now with petrol prices getting stupid.
Ive read ECU tuning is limited and expensive, any suggestions ? Is there anything basic and cheap for tune ? Can you play with the fuel and ignition for economy ? Can we chuck the standard air filters back in and just run it on normal unleaded ?