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Not too long back I rolled into my Subaru dealership after replacing two of my tires because of a nail in one of the sidewalls. The tread on the older pair was still fine.
The service rep told me I needed at least two new tires, preferably all four. She said you have to replace all of them at the same time, and that there was too big a difference in the diameter of my front and rear tires.
I knew exactly where she was headed with that, but I decided to feed her some string anyway and asked why the tire diameter mattered.
As if explaining it for the thousandth time (which it probably was), "If the tires are not the same size, it messes with the sensors on the all wheel drive."
"That's a rear wheel drive car," I said.
She stared at me for a moment in complete confusion, until it clicked, and she and I both started laughing. She put her hand on my arm and said, "You're right! I'm so used to everything here being all wheel drive I forgot that car doesn't have it! Never mind!"
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