I had mine done a few months back. Didn't take it all the way to 0 toe but the front was at 0.13 per side and I had them bring it down to 0.01 per side.
For the rears I had to get a shim kit as the alignment is not adjustable but I brought it down from 0.22 to 0.06.
Most of my driving is under 55 mph and feels fine but I have had it up to 70 and only had the slightest bit of float.
While you can't do an A-B-A for something like this I would say it was good for 2%-3%. I'm on new tires as compared to last year and have redone my grill block to be more efficient so I'm not able to do year over year progress comparisons.
Worth it if you need an alignment anyway but I wouldn't go out of your way just to do it.
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Lifetime mpg
2012 mpg
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