is it safe to fill your tires up past what is recommended? i'd rather not have a blow out.
I can only tell you my experience with tire pressure.
I've run a lot of tires at significantly higher pressures than the sidewall rating's. For example, max 35, I've run as high as 75 or 80 and I have not had any blowout's from running them high and heavily loaded. I have only had blowout's, primarily, from lower tire pressure's combined with the heat from traveling for long distance's. The second highest source I have encountered has been junk on the road, like ree-bar, in which case, all bet's are off, anyway.
I am currently running all of our car's at 55 and we haven't experienced any difficulties with blow out's, that I'm aware of.
I'm working on my "technique". I'm driving with the windows up (kinda warm though, maybe I'll lose some weight and further my FE gains ). I'm coasting (motor on) to the stoplights, trying not to have to come to a stop and I'm turning the motor off if I do have to stop. Driving at 55 mph max also, I was driving up to 65 mph when I got the 49.61 mpg. We'll see how this all works out.
"If the engine ain't running it ain't using gas!"