92 Honda Accord LX fuel mileage went from 35mpg to 10mpg in just a week have not changed driving habit everything runs/idles normal no leak?

92 Honda Accord LX fuel mileage went from 35mpg to 10mpg in just a week have not changed driving habit everything runs/idles normal no leak?

First check the air pressure in your tires. Low pressure can cause reduced fuel mileage.

Do you have a manual or automatic? With a manual a slipping clutch can cause problems, but you would feel the engine reving much higher than normal.

It is possible you have a fuel leak, or it could be that someone siphoned your tank while it was parked.