Texas Health and Safety Code - HEALTH & SAFETY § 395.004. Motor Vehicle Requirements

(a) A grant recipient may purchase or lease with money from a grant under the program a new motor vehicle that is originally manufactured to operate using one or more alternative fuels or is converted to operate using one or more alternative fuels before the first retail sale of the vehicle, and that:

(b) A grant recipient may not use money from a grant under the program to replace a motor vehicle, transit bus, or school bus that operates on an alternative fuel unless the replacement vehicle produces fewer emissions and has greater fuel efficiency than the vehicle being replaced.