BigMcLargeHuge,

yous seem to overlook that it does not matter how many liter/kilomter (liters per kilometers) one needs but rather how much pollution in terms of for instance CO2 per kilometer is produced. One liter of Diesel produces a 13.5 % more CO2 than a liter of gasoline. So please, be fair and compare what matters to nature. If you then look at the numbers, the picture changes. The best Diesel engine gives you hardly a 10% advantage. Yet, the there is not yet a clean Diesel built in the German versions, which will cost you an additional 5 to 10%! So, finally, there is no advantage of a Diesel over a gasonline engine for this mid-size cars. If cars get smaller the Diesel can no longer keep up. If Cars get heavier, the Diesel seems advantageous. The issue with the smallest cancerogenous particles remains however.
In terms of torque you are right. A Diesel has a better acceleration over a gasoline car. Yet a full Hybrid has the best acceleration. There is hardly any engine that can keep up with the acceleration of an electric engine.