Car Doctor Q and A: The difference between V-rated and H-rated tires

Q. I have a 2019 Acura RDX and I am thinking of buying a new set of tires. The car came with Continental Cross Contact lX sport 235/55 R19.

Continental offers a Continental True Contact Touring tire that is the same size tire and about the same cost but claims it has a longer life. My question is: Can I put these tires on my car without any problems? A. The tires are the same size but slightly different.

The Cross Contact is a V-rated tire with a speed rating of 149 mph. The True Contact has a lower speed rating of 130 mph (H-rated) with a slightly deeper tread (which adds to a bit longer life). Also, the V-rated tire can carry slightly more weight than the H-rated tire.

Unless your vehicle specifically requires a higher-performance V-rated tire, which is unlikely, both tires appear to be approved for the vehicle. Depending on your driving style and performance demands, the True Contact tires are a suitable replacement. Q.

I am getting my fuel injectors cleaned on my 2014 Toyota Camry. Does it matter how much gas I have in the tank? A. Typically, when a fuel injection service is performed the tech will clean the throttle plate and then disconnect the fuel supply and run the cleaner under pressure directly into the fuel system to clean the injectors.

The other more time-consuming method is to remove the injectors and clean them individually. In either case, the amount of fuel in the tank does not matter. Q.

I recently bought a new Dodge Challenger with a 5.7-liter hemi V8 engi.