0.14p a mile, not 14p a mile.
That's preposterous, even with LPG prices being roughly half petrol it works out to about 2000mpg

Prior to the slk I had a smart roadster 0.7l and with that I use to do a mile with 0.13p so I'm not sure how you mange that consumption with a 2.8l engine...
Indeed that does look odd - 30mpg sees me spend about £0.21 / mile at the moment (I'm guessing by 0.13p you actually mean 13p?) so i'd need to be achieving 60mpg from my 3 litre 6 to even get close to 9.5p/mile
Yeah sorry brain fart

Still, 14p/mile does seem low given nearly half fuel cost/L..