Call it the Stealth Gas-Tax Increase. Today California’s gas tax increases about 12 cents a gallon to pay for the newly budgeted $5.2 billion a year in supposed road repairs which the Legislature passed and Gov. Jerry Brown signed last April.

But few motorists will notice it. That’s because every Nov. 1 the state switches to what’s called the winter blend of gas, which is about 10 cents cheaper than the summer blend mandated from April 1 to Oct. 31. The summer blend costs more because it adds refinery steps to reduce pollution during the year’s hot, smoggy months.

The usual 10-cent reduction will be erased this year by the 12-cent increase, so the resulting 2-cent increase overall will hardly be on your radar. For a 15-gallon fill-up, it’s just 30 cents.

The “seeming” increase of 2 cents a gallon will appear to be a slight incline in cost for rebuilding the state’s roads, which TRIP, a national transportation research group, ranks as the worst in the nation.

But this respite from the nation’s highest gas taxes won’t last long.

The big impact will hit next April 1, when gas prices will have risen not just the 10 cents extra for the summer blend of gas, but also for the additional 12 cents for the new gas tax. Total: 22 cents per gallon. But of course, by then people for five months will have gotten used to the new, stealthy 12-cent gas tax. So they may only “feel” like gas went up 10 cents a gallon, as it always does on April 1.

Yet the new tax will be a collision to people’s wallets. Assume this for an average California family. Both spouses work. Together, they use 40 gallons a week driving to and from work, taking the kids to and from school and soccer practice and performing various errands. So the 12-cent new stealth tax totals $4.80 a week, or about $250 a year.

But what if the family, due to high housing costs, must commute long distances to work – say from Riverside to Orange County or Los Angeles. Then the cost of the stealth tax could rise to $500 or more a year.

But that’s not all. There’s also an additional Transportation Improvement Fee, which is really a tax, just to register your jalopy, bumping this annual ritual $25 to $175 a year, but averaging about $50.

All this detoured money could have gone for healthier food, schoolbooks, a college tuition savings plan, or just recreation for a family that works too long paying all the taxes that already hit them.

And there’s no guarantee the money will actually fix the roads the family drives on. The stealth taxes could be car-jacked during a recession, as Gov. Arnold Schwarzenegger did with earlier tax hikes for transportation during the 2008-10 Great Recession. With the state’s pension crisis accelerating, I predict the new taxes will be too tempting a target for a future Legislature and governor.

Indeed, even the new taxes paid at the gas pump will not fully go to fix the roads the cars ride on. According to the Legislative Analyst, $270 million will go to the transit and intercity rail program, $44 million to commuter rail and intercity rail, $100 million to bicycle and pedestrian projects and $108 million for parks and agriculture. And train and bus ridership is declining.

Although today’s tax increase is stealthy, its effect on the personal budgets of Californians will be substantial. And the state’s national reputation for fiscal irresponsibility continues out of control. It’s time to hit the brakes!

John Moorlach, R-Costa Mesa, is a state senator representing the 37th District.