My Scangauge 2 shows that my dark blue 2005 Civic gets reduced mileage when going up hills or accelerating, and increased mileage when going down hill or stopping. That makes sense. What does NOT make sense is that the MPG is highest at around 60-70 MPH. Should I just drive the speed that it reports the best mileage where legal and safe? A friend said that I should believe my Scangauge because my car will get its best mileage at higher speeds because, unlike his truck, my car is aerodynamic, so it is more efficient at a higher speed. That sort of makes sense. Is he right? Thanks, I want to save fuel by driving fast if possible
