thermostat temp

[kglowacky]

my engine is running at 181. my mechanic thinks we need to increase the temp to run more efficiently.
2002 trans am ls1 fully stock. looking for a higher temp thermo . seems the stock is 160 and I can't find anything over 180. He thinks we need 195. It appears my themo is a one piece unit. Does anyone sell a 195 . I can't seem to find one. Not sure what I currently have in there. I assume 160 just because I replaced at swap time with a ac Delco.