I discovered my mono valve was bad by driving the car with the heat on (which was only blowing cool air). I stopped the car for a few mins, started it again and hot air would blow for a minute or so, then it was back to cool. It seems the warm air from the engine was blown through...
14-18 mpg is about right. I get 12-15 city driving and probably around 20 mpg on the highway.
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