I've found a new information source...

[htc]

...at least new to me. It may well be old news to some of you. http://www.automobile-catalog.com/
Can retrieve detailed specs like this http://www.automobile-catalog.com/auta_details1.php for vehicles since 1945, or so it says.

Nifty, methinks.

[htc]

Weird, the second link should be to the 90 Festiva LX page... and I can't find the edit button.