They did mention petroleum in the chat with "uncle Johnny" so probably yes.
I've also been curious what the current knowledge was before she showed up and how much she knows about it. Presumably she would read whatever was available but we haven't been shown that.
Its honestly refreshing to see a couple unabashedly horny for each other in this kind of story and actually doing more than blushing.
The jokes are pretty good too.
Two Julius's in a row lol.
I feel like this is a better execution of the "I pretended I was gonna break up with you" than some of the other attempts in past volumes.
The isekai bit seems to be just for the opening dialogue.
Its not an older model. Melty baby was holding the gun when it got shot and the casing was either blown off by the other death beams or fell off from the impact