People worried they'll never get a scarce human transplant want to know when they might get a pig kidney instead.

The dollars-and-cents counter on the gas pump seems to be spinning faster these days with U.S. gasoline prices hitting another record high on Tuesday.

Any motorist who has filled up lately could be forgiven for wincing in disbelief.

The man who received the first pig heart transplant is continuing to recover from the experimental surgery.