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Xist, We are using the alloy space saver Insight 4"X14" rim with RE92 tires. The only difference I can see between the space saver rim and the Insight regular rims is the regular is 5 1/2" wide. I think the 50 MPH limit warning is because of the spare donut tire, not the rim.
I have put over 12,000 miles on a set of the 4" wide space saver rims and RE92 tire and have had no issues. I have not noticed any difference in braking ability, but as you say, we are not doing any heavy braking anyway.
I have seen 1 1/2 to 2 MPG gain using this combo compared to the same tire running on the 5 1/2" wide Insight rim (60 lb of air in each) The tire is noticeably narrower
And of course I am using the 4"space saver on all 4 corners of the car.
The 4" wide wheel is about 1 1/2 lbs lighter than the 5 1/2"
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