Fuel Economy: Is Diesel An Option?

In response to my previous kvetching about the scarcity of cheap fuel efficient cars, JWK commented that his 2001 Golf TDI gets 48 MPG (it’s rated for 44). Meanwhile, TreeHugger pointed out that Volkswagen’s Polo BlueMotion gets 62 MPG (Volkswagen UK claims the current Polo hatchback gets up to 72 MPG in diesel (I assume […] » about 400 words