the 280 te wagon runs at close to 100. a little under when it's cool outside and a little hotter when i'm in traffic. the oil pressure will drop to 1 bar at idle and a hair or two under if the a/c is on. is this normal? i run 20/50 dino oil. i see posts where members talk of 20 to 24 mpg, is that right? i think i'm getting closer to 16.