I have a 2012 mazda 3 skyactiv. Not even kidding, if there is a slight incline on the highway not only can i not maintain 65 mph, I actually start to lose speed. Then my car shifts into 5th, and even then it'll still decline. I had 95' sentras and old *** non tuned cars drivin by middle aged women pass me. This is absurd. Does anyone else experience this? My car shifted into 4th gear going 60 mph at around 3500 rpm and it still wasn't enough to accelerate. Once again, absurd. Anyone else notice this on the highway?