Just to clarify, yes, my MPG is actually worse now.
Because of the trailer, I use less fuel overall, true (and that's the important fact).
But by omitting some local driving (where I can achieve my highest MPG figures), my driving is further biased towards highway use. As a result of the higher proportion of (lower MPG) highway driving, my calculated MPG for a given tank is lower than it would have otherwise been had I just driven the car locally instead of using the bike/trailer.
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