I use cruise control maybe once or twice a week. A trip to work on a Saturday morning I used it sometimes on my monthly 90 drive I will use it if traffic permits. My son and I have driven various speeds to check MPG a steady 65 to 70 I averaged 50 MPG weather was 45 to 50 F This is a heck of a lot better than my LS400 at about 20 MPG same trip.