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Try the Nokian Hakka's for winter tires. My mileage actually went UP in winter with these. These a good vid on youtube if you look for NOKIAN ROLLING RESISTANCE TEST.
If you do some of the mods to remove friction in the powertrain with better lubricants, eventually the other half will realize they're driving more erratically by not changing their driving habits. Get ceramic brake pads which dig in more aggressively and this will become FAR more evident.
Worked on my better half
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