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I don't know the specs on your car but, if there is a catalytic converter it too
needs to be warmed up. IIRC, this involves an over-rich fuel/air mixture so that
some small amount of fuel is burned in the cat converter...
So, to get best MPG in addition to all the other things that must be warmed up,
not just the block and coolant, but wheel bearings, etc, which require
heat/movement/friction = fuel consumed, there's the cat converter as well.
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