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I get 23 to 24 out of ours, that's 50/50 highway/city. worst I got was 21 this winter, best was 28, but that was with a big tailwind and only going 60-65, all highway, trying hard to get good mileage.
23MPG last tank. With the many very short trips and towing we do we almost never get better than that.
If it were not limited by its aerodynamic challenges I think over 30 would be possible.