DETROIT (AP/ CBS DETROIT) — After some time of seeing prices going down, the average gas price in Michigan has hit a record high on Tuesday.

According to AAA, the state record sits at $4.34 a gallon, which is two cents more than on Monday. Diesel sits at $5.25.

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“Tight gasoline stocks along with volatility in the crude oil market has pushed Michigan gas prices above $4 a gallon for the first time in almost three weeks,” Adrienne Woodland, spokesperson for AAA-The Auto Club Group, said last week. “Pump prices will likely continue to face upward pressure as oil prices remain above $100 per barrel.”

The state average is about 40 cents more than this time last month and sits slightly below the national average of $4.37, which is 17 cents more than last week.

Last year at this time, the national average was just $2.97 per gallon. Crude oil prices already were high largely because many countries are refusing to buy Russian oil due to the invasion of Ukraine. And now we’re heading into peak driving season and demand is up.

That means the cost to pump 15 gallons into a vehicle is now a whopping $65.55. Four fill-ups per month would cost more than $260, a big chunk out of just about anyone’s budget.

With gas prices that high, owners may be thinking about replacing their older vehicles with something more efficient. But that may not be cost effective. The global shortage of computer chips and other parts has cut into the production of new vehicles, driving prices up. That sent many people into the used car market, also pushing up prices.

The average used vehicle cost $31,218 last month. The average new one? $45,341, according to Edmunds.com.

Generally, comparable electric vehicles are even more expensive than gasoline-fueled ones, though charging the battery is typically much cheaper.

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All is not necessarily lost. There are steps you can take to make an old car, truck or SUV perform better, go farther and perhaps save some money on fuel:

— Make sure there’s enough air in the tires. Underinflated tires create more rolling resistance with the pavement, thereby reducing gas mileage. Inflate your tires to the pressure recommended on the inside of your driver’s side door. Check them periodically with a tire pressure gauge. “Typically, your gas mileage is going to be impacted by about 5% to 10% if you don’t have proper inflation,” said David Bennett, manager of repair systems for AAA. But don’t over-inflate. Doing so could cause tires to wear out more quickly.

— Properly maintain your vehicle. Follow the manufacturer’s recommendations for oil and other fluid changes and for replacing air and other filters. Replacing spark plugs at the proper intervals can help, too. “The vehicle is going to operate at its peak efficiency” with good maintenance, Bennett said. It will cost between $235 and $289 for new spark plugs on, say, a 10-year-old Ford F-150 pickup with a 4.6-liter V8, according to Repairpal.com.

— Watch your speed. AAA says fuel economy peaks around 50 miles per hour on most vehicles, then drops as speed rises. Reducing highway speeds by 5 mph (8 kilometers per hour) to 10 mph improves gas mileage by up to 14%.

— Plan your route in advance. Try to minimize backtracking. Do multiple tasks on each trip. Avoid rush hours and other peak travel times.

— Don’t idle too much. An engine burns one-quarter to a half-gallon (1.9 liters) of gas per hour when idling, but a warm engine needs only around 10 seconds worth of fuel to restart, according to AAA. So when safely possible, shut your engine off if you’ll be stopped for more than a minute. Many new vehicles do this on their own. Bennett says owners shouldn’t disable their new “stop-start” system.

— Coast to stop lights. Time your travel to keep rolling and avoid unnecessary stops. Cars consume a lot of fuel to get moving from a dead stop.

— Fill up with gasoline designated as “Top Tier.” Oil companies put additives in Top Tier gas that cuts carbon deposits. “As you start getting carbon buildup, the vehicle will not be running as efficiently,” Bennett said. Gasoline brands with additives have stickers on the pumps. They can be found at https://toptiergas.com/licensed-brands/.

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