When I was in the US, I towed my N60 with a Nisan Sentra. Did fine up to 60mph (100Km/h), but milage when from 40mpg to 20mpg and windage from trucks meant I could never pass anything at any speed. As important as the car, is the trailer-- get a good quality one, preferably light-- I am in love with Trailex. It will compensate for 30+hp and an extra 800lbs (400kg) of car size.

Eric mentioned European diesels. I now now with a Mazda6 wagon. 140-160km (90-100mph) with a well strapped down A-cat is no problem. Fuel consumption is still above 25mpg even at that speed. 2/3 of all European cars sold are now diesels. They get 30% better mileage, just as quiet (except perhaps a slight difference at idle), start just as easy; however, they have so much more torque that you never need to shift to stay in the power. This is not the same diesel technology offered in VWs in the USA or found in even the newest Dodge-Cummings. As I understand the problem was sulfer found in US Diesel fuel-- this would destroy the modern Euro direct injection diesels. The result, USA diesels had to use only the old technology. About 1 year ago, the US forced the fuel companies to remove this sulfer-- now you should be starting to get them. I highly recommend trying one when they start showing up in dealers.

Matt