I have an 03 Thunderbird and the letter E appears next to the odometer. What does this mean?

In a 2003 Thunderbird, the letter "E" next to the odometer typically indicates that the vehicle is in "economy" mode or that the odometer is displaying information related to fuel economy. It may also suggest that the car is in a specific mode for monitoring fuel efficiency. If you’re unsure or if the light remains on, it’s a good idea to consult the owner’s manual or a mechanic for further clarification.