Will it go 300,000 miles? Of course it will.
Will it go 300,000 miles without a major repair? Unlikely - especially one of those I-4 engines.
But, you know, anomalies exist, and your vehicle could be that one.
My question is: how does one drive 50,000 miles per year? I drove 30,000 miles per year, 3 years in a row, in my '89 Colt/Mitsubishi (1.5L 90 HP engine), back in '92-'94, and it felt like I was living in my car! That little engine, BTW, went 255,000 miles with *no engine work whatsoever* (so this is why I say any engine should be able to reach 300,000 miles). Just oil changes, plugs, wires, etc. Now the original 4-speed transmission *did* start popping out of gear at ~165,000 miles, but I threw in a junkyard 5-speed for $300 and drove the rest of the way on that! That car was amazing!