Due to various offsets, a $2 trillion federal investment would increase infrastructure spending across all levels of government increases between $440 billion and $2,033 billion---including the original $2 trillion---based on evidence of past experience.
If a gas tax were used to fully fund the $2 trillion investment, the gas tax would have to rise by $1.67 per gallon for 10 years, thereby increasing the current federal gas tax from $0.184 (18.4 cents) per gallon to $1.854 per gallon.
If fully deficit-financed, the $2 trillion infrastructure proposal lowers GDP between 0.1 and 0.5 by 2043, relative to current policy. If fully financed with user fees or higher gas taxes it typically boosts GDP, between -0.1 and 0.4 percent by 2043.