Yes, but I don't recommend continuous use of them. Maybe once a month for the STP. If your car still runs rough, Tune It Up. That will increase your mileage by 100%.
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I agree with Tortuga, keeping your engine properly tuned and your tires inflated to the correct pressure will have a greater impact on fuel mileage. Not to mention driving conservatively.
For the best answers, search on this site shorturl.im/axfQp The expression loaded for bearmeans that the person is well-prepared. It probably originated during colonial times when muskets, gun powder, horses, and dogs were used to hunt for meat. In the present time, it means well prepared to fight, debate, discuss, take a test, give a speech, or provide evidence and testimony in the prosecution of a law suit. I first heard this expression when I was a child growing up in upstate New York. But I haven't heard it in the midwest, or the east, or the far west at all. I may have used it myself when I was in the deep South.
A wet blanket is used to put out a fire, so when someone says you are a wet blanket they are saying you are choking out everybody else's fun.
