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The FE of my TDI during winter is really bad. On the highway at 70 mph there is a 10 mpg difference between summer and winter (50 down to 40).
I can't say for the elantra yet, but one thing I already hate when then engine is cold is that it will idle at 1500 rpm. I know how to fix that however and will mod it to rev at a more acceptable 1000 rpm when cold.
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