I see; I might root around the Thermal Plant and other buildings in the vicinity for a bit before moving on to the Smoggy Highway, though at the rate that I'm going, it would be much easier if you could explain what all the riddles meant as well as point me in the direction for uncovering the remaining lore (as well as where to find the upgrade for the Cryosphere gun).
My analysis of my previous save files and current file indicate that I had gained about 6 lore in between the Smoggy Highway and the final fight with Smith/heart amalgamation in a building (where he briefly regains his consciousness, shows his remorse, then warns you to get away before he explodes), bringing my total lore collection to 44 in 2017. The ending I previously obtained, which may or may not be the Neutral ending, had Mario and Sarah sitting at a campfire after getting everyone else to safety (Emily Withers, Jack Deadwater, Albert Coffee, Cain Brown/Buddy and the other female scientist).
Hmm, it is sad that Mario might not be able to rescue Voice after all, though that leaves certain parts unanswered, such as what was behind that door that she had previously unlocked before the Thermal Plant and Vegetation building, as well as what she and Teal were up to.