Aaron Gold, About's Guide to Cars, is a big diesel proponent. I think I know why.

Earlier in his career, Aaron spent time in the UK interning for "What Car?" magazine. Because of their efficiency, diesel engines are much more common in the UK and across Europe. So efficient that people have been willing to overlook diesel's perceived downsides -- noise, smoke, lack of horsepower and excessive vibration. Where I see a low power, Aaron points to great torque. Where I see smoke, Aaron highlights EPA compliance and lowered emissions. Where I hear noise, Aaron hears the sweet music of an efficient engine.

Maybe he's right, when it comes to the 2007 Mercedes-Benz E320 BLUETEC. He praises the new Merc's clean-diesel technology and 26 mpg city/37 mpg highway fuel economy -- astounding numbers for a car the size of the E320.

My most recent experience with a diesel was not so great -- I drove the Jeep Liberty Limited 4x4 CRD, and I have to say, I was unimpressed.

What are your feelings about diesel? Would you drive a diesel car or SUV?

Photo © Jason Fogelson