My 'low fuel' light comes on when the car says 50 miles to E; however, the odometer reads incorrectly, as the 'miles to E' rate is over double of what I'm driving...e.g., I'm on a 10-mile route but the odometer says I've traveled 21 miles. (Speedometer reads about 10 miles slow when I'm actually traveling 55, it says I'm going 45 for instance). No idea if this is an electrical issue, a fuel-system issue or what.

noticed speedometer started jumping when trans was acting up, hooked up two different gps in car and read 4 mph faster than speedometer