I have a Tucson 2022 and I'm experiencing that sound between 20 mph to 30 mph and 1500 rpm at 40 mph or more the growling noise disappear. From now I'm going to fill up the tank with premium or high octane gas to see if the noise disappear...
Don't waste your money. The engine is designed to operate on 87 regular. All the concerns about knocking (above) are unfounded. The knock detection system in this car is state of the art. It will detect this LONG BEFORE your ears (or your but) ever will. If a condition exists that might result in pre-ignition or "knock," the computer will adjust all related systems to eliminate this in a fraction of a second, and you won't feel or hear the difference. I repeat: you'll never know there was a knock. This "growling" is not engine knock.
FWIW, BIG OIL loves it when consumers hope that buying premium will help their engines (engines designed to run on regular). Ha, maybe that's why they charge a dollar per gallon more for the stuff. Can you spell...
C-R-O-O-K ??? It only costs a penny or two to make it but they're laughing "all the way to the bank" (as the old saying goes) with premium generated profits. .
The "growling" you hear or feel is just the normal operation of the engine and is nothing to be concerned about. Just ask the pro's at the service department: they'll tell you the same thing. Forums like this can sometimes cause you to think otherwise.
While I'm on the subject, once upon a time, putting premium into the tank was considered a good thing due to its improved detergent concentration. This is no longer the case: as stated above, top tier fuels are the way to go for this same reason: and regular contains all the detergent your engine could need.
I need to fill the tank and I'm going to move to a top tier supplier and see if I hear/feel any difference....
Gary:
Appreciate your willingness to provide some feedback here, but it's very unlikely that you'll notice a difference. Will there be a difference? Yes, but you won't notice it. Top tier fuels have a greater amount of detergents in them (2-3 times the minimum amount mandated by the government). But the effect they have on engine deposits is preventative, not curative. Detergents will reduce the amount of deposits that build up on backside of your intake valves and inside your fuel injectors. But though they help prevent deposits from forming, there is no evidence that I know of that they can remove or reduce deposits that have previously formed. They can prevent, but will not cure. Therefore, you will not be able to feel what they do for your engine.
There are many additives available over the counter at your local auto parts store. Some can help, but most do not. But beware. Some of them can contaminate your catalytic converter, especially when you use too much.
