Quote:
Originally Posted by ghengis86
Re temp; why is that and why so dramatic? Cold tranny fluid and increased driveline resistance? Too much engine cooling and reduced combustion efficiency? I thought that winter gas blends had less energy per liter than summer too.
/curious
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All of the above...
- increased time spent below normal operating temp (= fuel enrichment)
- auto transmissions hold lower gears longer while in warm-up mode
- increased fluid viscosity (engine, transmission, bearing grease)
- increased tire rolling resistance, even at the same PSI
- increased electrical loads (heater blower, lights, defrosters, seat heaters, wipers)
- slightly increased aero drag from higher air density
- and of course driving in more wet/slush/snow