That is a very low gas tax. In Germany it's €2.47 per gallon/ €0.65 per liter.
Edit: Your numbers for california amount to about $10.6B per year - and the transportation budget for california for the current fiscal year is $23.5 billion [0]. So the tax pays for less than half of the costs.
[0] = https://lao.ca.gov/Publications/Report/3948#Overview_of_Gove...
California comes in second on the list of states with the highest gas tax at 72.76 cents per gallon. Rising fuel prices and increased taxation are the primary reasons for this.
A law that was passed in 2017 allowed the state of California to increase the gas tax by a steep 12 cents, because it seemed like the most viable way to obtain the funds needed to replace several bridges and fund other important road projects.
You can expect the state’s gas tax to increase further by 7.5 cents per gallon in a few months.
We consume 10% of the US’ gas consumption i. California.
We consume more than 40 million gallons per day. There are opaque additonal taxes on each gallon sold at the nearly 9,000 gas stations and billions in taxes are also missing.
https://www.sandiegouniontribune.com/business/energy-green/s...
And not all taxes are hitting our roads...