In our tests, we've found that in some cars a manual transmission can improve gas mileage by a significant 2 to 5 mpg, compared with an automatic, and can cut a car's price by $800 to $1,200.

Defects arise/caused by accidents, alteration, misuse, neglect, substitution of original components with spurious/non-genuine components, attacked by household pest/ rodents, flood, earthquake, ...