Please let me know what you think of this one:

Gasolina.org

Over 4,000,000 Broad/Phrase Monthly Searches over at Google.com
450,000 exact monthly searches

The highest number of national searches is no doubt coming from Spain, Brazil, Portugal, Mexico etc. as "Gasolina" means Gasoline/Petrol in Spanish, Portuguese etc.
I visit Portugal every 2 years and I remember seeing "Gasolina" on every single gas station in each town we travel to. The term must be pretty strong and I think it fits the .ORG extension nicely.

Let me know your thoughts.
Thanks.