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oil temp
For years I have felt that allowing the engine to run for a minute or so (no a half hour!) before driving in cold weather delivered better FE. I have no way to prove it under controlled conditions and have to rely on observing MPG / conditions. Many argue that allowing an engine to idle is a pure waste because it is burning fuel without moving the vehicle. While this is true, there may be a synergistic effect that isn't so obvious like warming the oil and reducing engine drag.
I often think of the winglets on the ends of an airplanes wings. They provide no lift, they increase drag, but they make the wing as a whole more efficient. Interactions can be less than obvious some times.
Does anyone have the time / equipment / inclination to determine air temp, oil temp, fuel consumption rate vs time? That might show some huge insight into what we all are fighting.
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