I have a '97 with that combination. While I was using it for my commute of 60 miles daily, which was mostly highway I would consistently average 24.5 mpg in the summer, and 20.5 in the winter. In pure long distance highway travel, I have seen 27 mpg. My daughter now uses it to commute 8 miles daily, but she keeps no records. I'll leave it to you to do the metric conversion.