Closest thing I can think of to warming up the engine without a block heater is just parking it in a heated garage or using an electric blanket (though this has disaster written all over it to me, without some waterproofing precautions) and I'm not even sure if the latter would really warm up the engine fast enough.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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