Indiana Code Title 6. Taxation § 6-6-14-5

Sec. 5. (a) The owner of a motor vehicle that is propelled by alternative fuel and is:

shall obtain a temporary trip permit. An alternative fuel temporary trip permit may be purchased from a licensed propane dealer who sells alternative fuels.

(b) A temporary trip permit is valid for seventy-two (72) hours from the time of purchase.  The fee for each permit is five dollars and fifty cents ($5.50).  The fee for an alternative temporary trip permit must be collected from the purchaser by the licensed propane dealer and paid monthly to the administrator on forms prescribed by the department.