How far can a passenger plane taxi?
The number will vary depending on the aircraft type &amp; installed engines (how much fuel it holds, and how much fuel it burns per hour at taxi speed), but the ballpark figure is "Much less than the range in flight", because the specific fuel consumption figures (how much power, and thus distance, you get per unit of fuel burned) are less favorable during taxi than at cruise.



To work an example I used the numbers for an A320 taken from here and not checked it burns 270-330kg/hr (depending on the engines installed) so let's split the difference and say 300kg/hr as an average.

The A320 can hold around 15,000kg of fuel, so doing the division it could run its engines at taxi power for around 45 hours.  

If we assume a taxi speed of 20kts for 45 hours the aircraft could theoretically taxi 900 nautical miles (1036 statute miles, or 1667km), a little less than one-third of the range in flight.