Yup, my HDI only does on average 43 mpg, so I do agree it doesn't make sense as the 16 petrol seems only slightly less on mpg and on cheaper fuel. It probably works out the same to run but the purchase cost is more on the diesel so the 16 petrol has to be favorites. Contradicting myself I feel! It is down to personal choice, I wouldn't buy a petrol car as I prefer the "feel" of a diesel engine. I recently bought a LandRover as a toy/second car and one of the biggest consideration in buying was the fuel type. Diesel of course. Ya pays ya money.........:P The Picasso is alot more economical I suppose because of the smoother lines and shape, not so much of the "rounded off brick" shape of the Berlingo. :D