"State lawmakers have also raided gas tax for non-road purposes beyond those allowed in the Texas Constitution. According to the Texas Public Policy Foundation, 47 percent of the state gasoline tax is diverted to non-road uses."
Above & Beyond, 2017 Annual Report
The 2017 annual report "Above & Beyond" highlights the Texas Public Policy Foundation's impact, outreach, and finances in 2017. 2017 TPPF Annual Report by texaspolicy on Scribd