I have a diesel Peugeot 407 and a 2.0 TDI mk5 golf. I love the diesels. The torque is amazing and with the DSG it's great fun to drive.
We test drove the diesel and the petrol RS wagons, and both were great fun.... If you're planning to stick to the speed limit, there's not much difference IMO.
The difference for us was on our test drive route, the diesel averaged about 8L/100km and the petrol about 12. Admittedly we were probably having a little more fun in the petrol 
I was looking at camper trailers too but the towball weight limit in any of the octavias is too low. I even told this is a problem with many (most?) European cars.
2007 Golf 2.0 TDI Comfortline DSG/ESP
MY15 Octavia RS Wagon 135TDI, Race Blue, 18" Black Pack, Tech Pack, Comfort Pack, Auto Tailgate (on order)
2007 Golf 2.0 TDI Comfortline DSG/ESP
MY15.5 Octavia RS Wagon 135TDI, Race Blue, 18" Black Pack, Tech Pack, Comfort Pack, Auto Tailgate, Panoramic Sunroof
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