[jcp123]

20% doesn’t seem out of order, really.

I believe that a/c drag increases more slowly than engine output as you go from smaller to larger vehicles, so smaller vehicles tend to take more of a hit than larger ones. My Echo and Civic both take pretty big hits, similar to yours, where my wife’s Town + Country, at roughly 2.5x the displacement, interior volume, and engine output, barely even registers a drain, probably on the order of under 10% (I don’t drive it enough to really know). Granted, it’s nearly two decades newer, so that probably helps vs my Japanese beaters.