HoloFuel (HOLO) is a tokenless cryptocurrency. Holo fuel will have a different ticker. Further swap details will be released in time.
Holo Token (HOT) is an Ethereum (ERC20) token that was sold at ICO as an IOU for HoloFuel. No more of these can be created or minted.
Holo fuel is a mutual credit cryptocurrency that HOT can be swapped with in 2019 (after Holo Beta release).
Regardless of the then monetary value of either HOT or Holo fuel, HOT will be accepted in a straight swap — 1 HOT for 1 HoloFuel. There will be an extended period during which you can participate in the swap.