Time is money. FE isn't always the bottom line. Calculate how much her time is worth, then factor in time saved by speeding vs money saved by going 55. Why the heck are you commuting in a minivan with only 1-2 people in it? Picking a fight over 2-3 mpg in a mostly empty minivan is being penny-wise and pound-foolish.
And what's with you married guys having your wives "approve" purchases? Do you not make any money yourselves? Jeeeeezus, you're killing me!
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