As slowmover suggests, I think the answer for most will depend on what type of driving is typically done (how the vehicle is typically used).
So I said both, for me. Mods permit me to hypermile at a higher average speed and still get great MPG.
Getting crazy high MPG numbers is challenging and fun, and I sometimes play the game. But since I predominantly use my car for highway driving, a low average speed isn't as practical.
I've always felt it's reasonable to "spend" a portion of the efficiency dividend gained through mods on a higher average speed - it's good to be able to go at the speed limit when there's traffic.
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