"My wife had her 09 tinted at a tint shop, even if you're familiar with applying graphics on glass with soapy water, the d.i.y. tint is very easy to scratch during application, I'm all for saving money but I paid so any problems were on…"
"The lower part of the windshield has the factory tint in the glass. I do not know the percent of tint, but it appears to be the same as the other windows before I had the film applied. I have noticed in several car commercials, the…"
"It helps a lot to see the pictures. Tint as dark as yours would definitely get me pulled over here, but what I really wanted to see was the front window, and if it looks really different from the rest of the windows, and also the discrepancy between…"
It sort of works the way you indicated. Mix 50% 87 octane with 50% 91 octane & I hear that you can get around 93 octance this way. Hopefully, there is a petroleum engineer out there who can verify this. To keep it simple, just use Premium 91 octane.