There is no way on God's green earth that this will work out, at least without a great deal of pain.
The only way to do it is to hit her in the wallet. The two of you should determine a monthly gas budget for her based on the mileage she should be getting. Give her that money; no more no less. If she runs out of gas money, oh well.
Everyone thinks they are a good driver. Telling someone they should change driving styles is akin to telling them they need to lose weight; however well intended, it won't be pretty.
Good luck with that.
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