After the discussion on petrol prices in the Lounge, this article may interest you:

http://theage.drive.com.au/motor-news/a-nation-of-fuel-guzzlers-20120314-1uzr8.html

Melbourne's petrol prices have generally been around $1.50/litre lately, which translates to around $6/gal in U.S. terms. In London (Swindon, SW11) it's 136.9 p/L ($8.08/gal).

The LCT mentioned in the comments in the luxury car tax, which applies to vehicles costing more than $50,000.

p.s. A bit of googling suggests that New Orleans area has petrol costs around $3.60/gal (or 90c/litre)... is that about right?