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It really is an interesting excercise davo.
BMW 120d 130kw/350nm 1375kg RWD manual
Audi A4tdi quattro 176kw/400nm 1690kg 4wd Tiptronic auto
Jag XFd 202kw/440nm 1820kg Rwd Paddle auto.
Based on brochure claims for models available in Australia. Manual available for both Audi and Jag in Europe, and according to the regs may be acceptable in that form if CAMS clears the paperwork.
No fiddling with the boost as inlet pressure as data loggers must be fitted and monitored. No fiddling with electronic programing for the transmissions, must be standard. Engine mapping software is free provided it doesn't increase max. boost.
Tank sizes in all probably exceed bladder capacity so long stints should be the order of the day with tyre and brake conservation important. Those factors may rule out the Jag. Audi has wieght and transmission disadvantage but the advantage of a very well sorted 4wd system. As you say the 120d might be the weapon.
It is a pity the manufacturers concerned are not interested in establishing themselves as the performance diesel leaders by using the 12hr as a demonstration.
Would give a few of the petrol "performance image" people something to think about as well.
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