The political situation in the Arabic world and increasing oil prices because of this have convinced Lotus that it is advisable to provide a Diesel engine for the US Elise.
Negotiations with VAG / Audi and Honda are still going on.
Ya know, in all seriousness, it is possible to have a high performance (and really really fun to drive) diesel car. A friend of mine has a modded VW Golf Diesel, and although its HP is only at somethig like 150, it gets nearly 400 foot pounds of torque. Amazing. Remember torque = low end acceleration, and hp = highend speed.
So, diesels have lots of torque, and they can really sprint off the line fast. Unfortunately, the thing has a redline of like 4k, which really blows.