23 mph on my last tank, and it doesn't vary much from there that I've seen. I tend to drive a lot of secondary/rural roads with 45 or 55 mph limits, but I work downtown, and have a lot of lights and stop signs to contend with there.
Edit - I am a courier, so the bulk of my driving is not commuting, it's short trips around the county, between 1 and 10 miles, very little on the highway.
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