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Is there any way to get more precise/repetitive than +/- 1in per 2 feet?
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Yes. Usually with the aid of software feedback control with the famous example being PID. However, just tuning and maximizing the consistency of the drivetrain, battery power, and having a ramping up / down function (to minimize slippage / skid) will be significantly easier and beneficial overall as it will help not only autonomous but also tele-op performances.
Also, in most scenarios +/- 1 in. is more than enough since the field usually have different elements (such as taped lines / walls / IR sensor) to "reset" the robot. With "advanced" implementation techniques (such as mounting the IR sensor on a servo, having multiple IR sensor from different angles, etc.) the IR sensor can be extremely beneficial; even just directly polling from the IR sensor and drive till a certain value is reached is accurate, as long as there is a shield to block out ambient light.