Review on 🔥 Enhance Engine Performance with Spark Plug Automotive 4/Box by John Ramsey

The moment I replaced these spark plugs for my truck I noticed a slight increase in horsepower and overall smoothness of the engine at idle. I can't say my gas mileage has increased much, but it has helped some. Maybe another 1-2 mpg. Of course, the winter miles per gallon difference was small here in New England, but starting made a big difference. I don't drive on the Autobahn very often, but I calculated that the fuel consumption was a little lower the few times I drove. I love them so much I bought a set for my antique sports car and two petrol garden tools.