Bolt Stretch Dry and Lubed Torqued to Failure

I took 4 bolts and torqued them both dry and lubed to failure to see the differences between the bolts. I started first with a 307A steel bolt at 2.26 in long and was torqued to failure dry at 64ftlbs with a overall stretch of 2.33in that's not that impressive of a bolt,lubed it did a little better and lasted until it got till 68.1ftlbs with not as much stretch as it had dry but still stretched to 2.28.Second on the table was a grade 5 bolt that was 2.285in to start and dry it failed at 134ftlbs and stretched to 2.35in, lubed it lasted to 87.7ftlbs and stretched to 2.32in. 3rd was a grade 8 bolt that started at 2.291in and after bieng torqued to 126ftlbs it failed and stretched to 2,33in. It didnt break off it stripped the threads out, lubed it lasted only to 115.4 ftlbs and stretched to 2.34in before it failed. 4th was the A325 steel bolt it started at 2.271in and dry it maxed out at 123ftlbs with a stretch to 2.26in, lubed it lasted to 122.22 with a failure at a max stretch measuring 2.29in.Its obvious to me that bolts lubed dont have the strength they do when dry on some occasions and they stretch a little bit more than they do when they are dry.

8 week
112 month