I believe that info about damaging your cat is fairly dated (note leaded fuel reference) and mostly applied to older cars with mechanical fuel pumps and carburetors.
Here's a EGT probe/pyrometer, which seems to be pretty good. Imo, this combined with some time with a local smog guy would be the best bet for figuring out the relationship between how cool you get pre-cat and how well the cat operates/how high HC emissions when the engine is started back up, so you can figure exactly what temperatures are best for EOCs/MPG/HCs.
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Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.