I consistently drive my MCS like it's stolen. shift around 5500 RPM. Traded in my 06' M6 for my MCS. V10 for 7 mile commute....ridiculous. MPG for me has been around 22 to 23MPG. I also have a VIP air intake, and a BMS B48 Stage 1 chip installed.
Your reduced MPG may also be attributed to poor quality gas. I prefer Shell, and settle for Chevron when I have to.
Your reduced MPG may also be attributed to poor quality gas. I prefer Shell, and settle for Chevron when I have to.