It would help if everyone posted mpg without towing for their vehicle as well.
Tow Vehicle:2000 Subaru Forester 5 spd manual transmission
Mileage empty: 27-28 mpg highway
Trailer: '70 Trailswest
Campster,
weight about 1000 lbs (hasn't been weighed packed but I don't carry much.)
Last trip: Washington to California down 101 and I5 and 99
Mileage towing 18-20 mpg
Speed 55-60 with trailer, 65-75 without.