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You know those things can't be predicted with much accuracy. It always depends. The first thing that comes to mind for me is your driving style.
If you are hypermiling and already doing a lot of coasting, then your tire upgrade and improved alignment are going to help proportionally more.
The individual gains are going to depend on how bad your situation is presently, - how much your current specs are hurting you while using your current driving style.
I think I've seen several people post individual gains between 3% and 6% by just increasing tire pressure from 32 PSI to 45 - 50 PSI. I'm sure that was for all four tires.
The LRR tires have claimed as much as 7% if I am remembering correctly.
I would just expect the worst and hope for the best.
The toe alignment can actually make a very large difference on some vehicles. Of course you'll have to check for play at all of your mounting points. Odd wear on just one tire usually means slop on one side. I know little to nothing about your particular car model.
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