Sushi restaurants in New York and Greenwich, Connecticut rank among the most expensive locales in the U.S. to buy the Japanese cuisine for the third year in a row.

The price of basic sushi at New York restaurants was about 26 percent higher than the national average this year, leading the Sushinomics Cost-of-Living Index for the third straight year. The index, compiled by Bloomberg Rankings, is based on prices for the two most standard items — spicy tuna and California rolls — at restaurants in 28 major cities.

Meanwhile, Greenwich topped the Sushinomics Premium Priced Index for the third straight year, which ranks cities by restaurants' two most expensive sushi rolls. Sushi lovers in Greenwich pay an average of $17.65 for the finest rolls, $1.72 more than the average price of New York's premium sushi.