Kaytag1,
I'm at a resort area at my brother's cottage. This side of the lake voltage is as low as 112 and as high as 117. The other side of the lake is 124 to 126.
I did a test and documented what was happening on 15 and 30 amp connections and started a thread. You might enjoy it.
The other area where the autoformer seems to shine (even on 50 amp) is for the start up surge from the roof air. It reacts almost instantly and boosts the voltage for a few seconds when the compressor starts. Early this evening voltage was at 115 on the 50 amp supply. Running the fridge and roof air was enough to trigger boost.