Towing a 70's or 80's (not sure how old) Dandy 4 loaded up with extras like a fridge and a carpet for the awning, we get around 18mpg with a 50's Land Rover. Towing with a Chrysler 300C, we get mid thirties... exactly the same as we get when not towing the Dandy.
The Land Rover likes to cruise at 48 mph so keeping to the towing speed limit is not hard. Unfortunately, the same can't be said for the Chrysler. I use the cruise control whenever I can. With both cars, it's easy to forget that the Dandy is there.
We also have a 1.7 diesel Kia Sportage but haven't towed the Dandy with that yet as we tend to use the Chrysler for long distance trips. We have used for it towing a one ton trailer (fully loaded) several times and it does knock a few miles off the 47-50mpg norm, particularly if the route is hilly. You need to use the gearbox a bit more when towing a ton too. Handling wise, you wouldn't know the trailer was there.
Last edited by Retro on Sat 07 Sep 2013, 10:41 am; edited 1 time in total (Reason for editing : Typos)