In the 2021season Rahal Letterman Lanigan Racing again expanded to three cars, with Graham Rahal and Takuma Sato driving two full-time entries while several drivers would drive a third car on a part-time basis. Graham Rahal drove #15 backed traditionally by United Rentals, American equipment rental company. Rahal’s best finish was 3rd at Texas Motor Speedway, but his consistent top-5 and top-10 placements put him to 7th position in the final series standings.
| Season | Series | Event |
| 2021 | IndyCar Series | |
| Driver | No. | Entrant |
| Graham Rahal | 15 | Rahal Letterman Lanigan Racing |
| Chassis | Engine | Car Name |
| Dallara DW12 (IR18) | Honda | United Rentals / Fifth Third Bank |
| Scale | Manufacturer | Collection |
| 1:64 | Greenlight | |
| Cat. No. | Quality | Rarity |
| 11511 | 
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