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^ if you can get 28 mpg at 80 mph... don't even worry about looking at your brakes.
I recently was getting 17-19 mpg highway and being a grandma in the city. I took my rear caliper apart since it was randomly screeching while off of the brakes. My last full highway trip was 26 mpg at about 75-80. And i have some major problems such as leaking/burning oil and a blown headgasket.
So you're right: you would know if your caliper was sticking at all.
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