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Will Narrower Tires With Taller Sidewalls Return, To Improve Fuel Economy?
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How much does a tire and rim weigh?
Now multiply that by thousands, and that's a lot of gas saved by lightening the load in the trunk.
If the back of the vehicle is designed to control the impact without adding a lot of weight, it probably is easier to justify the 'tire mobility kit'.
2014 Mini Cooper (stick shift of course), 2016 Camry hybrid, 2009 Outback Sport 5-spd (keeping the stick alive)
A couple years ago, I stepped on the scale with one of the wheels I had taken off my '79 New Yorker. I think it was around 53 pounds. That was for a 15x7 copcar wheel with a 235/70/R15 tire on it.
I'd guess most compact spares are around 25-30 lb? I actually put a compact spare in my '79 New Yorker, not for the weight savings, but for increased trunk space. The full-sized spare was mounted far forward and to the left, and took a lot of space, while the compact spare could actually stand up on its side, tucked in by the rear quarter panel on the passenger side.
2014 Mini Cooper (stick shift of course), 2016 Camry hybrid, 2009 Outback Sport 5-spd (keeping the stick alive)