@okie,
Okie. The point that I was really attempting to make was that the 18.4 cents per gallon federal fuel tax is not going to be sufficient to fund the necessary repairs to the interstate and similar other highway maintenance and construction needs.
Part of the reason, I argued, is the recession causing people to drive less. Part is the young people moving into urban areas and the big one is the movement towards cars that are more fuel efficient are don't use gasoline.
I see numbers being tossed around about gas consumption dropping around 5% annually lately. The percents are not attached to raw data, though.
A lot of the articles I found were either quite dated (2008-2009) are came from sources that I was suspicious of.
I did find the number of gallons of gasoline being used was totally in line with your number of 140Bn. My little calculator comes up with $26Bn in federal fuel tax revenues.
An article from the Society of Civil Engineers claimed that recent declines is fuel consumption - and I read this line several times - could result in an ANNUAL shortfall of funds needed for repairs from $105Bn in 2007 to $135Bn in 2017. That number, compared to the $26Bn in revenues from the gas tax is at the crux of my case.
I found an interesting article written by David Lawyer. It doesn't give much background on him. He poo poos the idea that the highways gets subsidized. If fact, he says that in the mid-1990's Congress raided the trust fund, sending about 25% of the revenues to reducing the national debt.
I found that, according to one source, 20% of the fuel tax ($5Bn) does get spent on non-highway related projects. You probably shouldn't read it if you have high blood pressure: bike lanes, hiking trails etc, etc. Fully half of the $5Bn goes to mass transit.
To summarize, Okie, I have no problem with the need for infrastructure, although I think it was accompanied by some unintended consequences such as sprawl, urban blight and pollution.
A point I was attempting to make is that the 18.4 cents is not going to fund our highway system. We can either raise it dramatically or use general revenue funds. Doing nothing is not an option as bridges start to fall down.
One leftover note: At some point the American Trucking Assn favored getting into greater use of mass transit. They estimated they lost almost $9Bn a year in fuel costs and lost productivity due to highway gridlock.
Again, sorry for not sourcing. Some of the numbers are probably old and/or wrong.