Today's readers have more scientific Knowledge than readers of previous eras what effect does that have on their reading of science fiction stories

Science Fiction

Explanation:

As the bold word above explains, science fiction is fiction, and that happens to be the main reason for people to read novels: because it's fiction.

So whether you are technological whizzard or utterly lost in modern science, it doesn't matter much when you are reading science fiction stories, you read them for a lot of other reasons. So the effect is minimal.