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It's difficult to achieve better economy through smarter driving on the interstate where speeds are constant. Additionally, there are too many variables in driving conditions to accurately assess who was the more efficient driver. I recently went on an 1800 mile round-trip on I-90, and I had a strong tailwind going east, giving me 36mpg. My fiance drove for 2hrs and achieved close to the average for the entire trip. There isn't much room for improvement when using the cruise control.
Variables on my trip:
Wind speed and direction
Lower grill block installed/removed
Fuel octane
Hills
Traffic
Temperature
Elevation
Road condition
Speed
To really get an accurate picture of the differences between you and your wife, you would need to track multiple trips and multiple tanks of gas. Urban driving would highlight these differences even more.
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