I really haven't checked my winter average although it will be higher than the winter average of many people because I live in an area of the country that has pretty mild winters for the most part. I have a mileage log if you'd like to compare my winter fillups to my summer fillups.
I plan on trying to keep the riser open during the summer if I don't see it affecting the engine temperature too much. I have an aftermarket temperature gauge with the actual temperature readings not just a cold and hot so I can monitor it pretty closely.
Mine is an '88 with a 1.9L 4 speed manual transmission.
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