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I've started driving 80 km/h (50 mph) as our local highways have a 100 km/h (62 mph) upper limit and a 60 km/h (37.5 mph) lower limit.
I'd go 60, but some cars do terribly at that... many seem geared for best economy between 70 and 80, so using an 80 reference point, I'm swinging between 70-90, depending on whether I'm going uphill or downhill.
Give our gas costs about $4.40 a gallon, I actually save between two to four dollars (depending on what I'm driving) on my 50 mile commute into the city when I have to go to the magazine or visit the in-laws. Granted, I get free fuel most of the time, but I dislike wasting gas when I don't have to.
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