
Then, Friday night, long cruise (500 miles or so) mostly at 75mph-ish. Previously fuel consumption at said speed would have been around 23mpg, but returned almost 26 mpg! This was, if you remember, on a very cold night. Now I know that when it's cold, turbo powered cars fair better performance-wise, but would it have been the temperature that suddenly increased my car's economy, or the fact that I'd recently given the car a good booting?