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euphoriatheory- I run 85% of my spring/summer/fall miles on streets and sidewalks. Gravel trails and/or grass 'gives' more, and so you likely are going to get a bit more out of your shoes if that's the majority of surface you run on. Heavier runners, or those that are 'heel strikers' will likely get less...
YMMV
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Strength does not come from how much weight you can lift, or how many miles you can run. It comes from knowing that you set a goal, and rose to the challenge. Strength comes from within.
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