The fam needs to travel fast with AC on our long haul trips, for me it's like 36 vs 55 mpg in the summer, per the SGII in the Civic, almost 50% difference (or 30%, depending which belongs in the denominator). Speed is a real MPG killer, but we're talking about a 10-hour haul here across interstates with 75 MPG PSL (well, part of the way) with fidgety tots in the back seat. I would swear there's something about the pavement or prevailing winds as well.
If anything your mere 5% loss on trips is admirable, if not enviable.
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