Faulty comparison: Any number of problems which arise from
claiming that two or more things are comparable.
Closely related: Faulty Analogy
Examples:
(i) "More people died in airplane crashes in 1990 than
in 1910, so flying is more dangerous now." Of course, almost
no one flew in 1910, so it's a faulty comparison.
(ii) "Exide batteries last twice as long." Twice
as long as what?
