I have noticed that in cold weather (below about 10 degs centigrade) my engine can take between 6 to 9 miles to show 3 bars on the temp display. It reaches 2 bars within about 2 miles. Also after about a mile on a downhill section 3 bars drop to 2 bars. In warmer weather normal engine temp is reached in 2 to 4 miles. Has anyone else experienced this or can offer an explanation?