Fair comment fellas
but as Aerosam needs a general purpose towcar to pull a lightweight trailer (I'm guessing around 250KGs) with a lightweight sportscar on it (I reckon around 550-600KGs max) with a likely total trailer mass of 850-900KGs his existing C5 diesel is going to be more than up to the job and will probably return a fair bit more than 32MPG into the bargain.
D.