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Any benefit happens mostly at acceleration, when you have to haul your weight to speed. Stop/go traffic and pulse and glide. Steady cruising at speed technically must mean a benefit but you are not going to detect it and it will be very very small.
I hate the sealants in cans. Worse than useless. I love the plug kits. I still have a plugged tire in service 10s of thousands of miles later. Awesome.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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