1. Short title This Act may be cited as the RTP Full Funding Act of 2018 . 2. Findings Congress finds that— (1) the recreational trails program under section 206 of title 23, United States Code— (A) helps develop and maintain valuable trail infrastructure across the United States; (B) benefits millions of diverse trail users, including users who participate in hiking, bicycling, in-line skating, equestrian use, cross-country skiing, snowmobiling, off-road mo­tor­cy­cling, all-terrain vehicle riding, 4-wheel driving, and other off-road motorized vehicle use; and (C) (i) embraces the user-pay-user-benefit model of the Highway Trust Fund; and (ii) is funded by a Federal tax on fuel used for nonhighway recreation; (2) to ensure that Federal taxes collected from nonhighway recreation are appropriately returned to the States for the recreational trails program, an accurate estimate of the total amount of nonhighway fuel taxes collected is necessary