More than 1,500 Reading fans are making the trip to relegation rivals Cheltenham Town next week after selling out the full allocation.
Despite sitting second from bottom in the third tier, the Royals away following has increased from previous years and currently average more than 1,000 per match.
903 went to Lincoln City on Saturday, with a sell-out following of almost 1,600 travelling to Whaddon Road on December 29.
The Robins are the only club below Reading in League One, currently two points behind the Royals but with a game in hand.
Winning 1-0 at the SCL Stadium in the reverse fixture, Reading have never played a league match at the Completely- Suzuki Stadium, last playing there in the FA Cup in 1998.
A waiting list has been set up for supporters in case of any returns.
Reading have sold out at Exeter City, Leyton Orient, Wycombe Wanderers and Eastleigh so far.
Only Blackpool and Lincoln saw fewer than 1,000 supporters travel from Berkshire.
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