IndyCar Driver Road/Street Power Rankings after 2018 Grand Prix of Portland
By Asher Fair
Non-formulated IndyCar Driver Road and Street Course Power Rankings
| Rank | Driver | Car, Team, Engine | Last Rank | Trend |
| 1 | Scott Dixon | #9, Chip Ganassi Racing, Honda | 1 | 0 |
| 2 | Ryan Hunter-Reay | #28, Andretti Autosport, Honda | 6 | +4 |
| 3 | Alexander Rossi | #27, Andretti Autosport, Honda | 2 | -1 |
| 4 | Josef Newgarden | #1, Team Penske, Chevrolet | 3 | -1 |
| 5 | Robert Wickens | #6, Schmidt Peterson Motorsports, Honda | 4 | -1 |
| 6 | Sebastien Bourdais | #18, Dale Coyne Racing, Honda | 7 | +1 |
| 7 | Will Power | #12, Team Penske, Chevrolet | 5 | -2 |
| 8 | Takuma Sato | #30, Rahal Letterman Lanigan Racing, Honda | 14 | +6 |
| 9 | Simon Pagenaud | #22, Team Penske, Chevrolet | 10 | +1 |
| 10 | James Hinchcliffe | #5, Schmidt Peterson Motorsports, Honda | 9 | -1 |
| 11 | Graham Rahal | #15, Rahal Letterman Lanigan Racing, Honda | 8 | -3 |
| 12 | Marco Andretti | #98, Andretti Herta Autosport, Honda | 11 | -1 |
| 13 | Ed Jones | #10, Chip Ganassi Racing, Honda | 12 | -1 |
| 14 | Tony Kanaan | #14, A.J. Foyt Enterprises, Chevrolet | 15 | +1 |
| 15 | Spencer Pigot | #21, Ed Carpenter Racing, Chevrolet | 16 | +1 |
| 16 | Charlie Kimball | #23, Carlin Motorsport, Chevrolet | 17 | +1 |
| 17 | Zach Veach | #26, Andretti Autosport, Honda | 13 | -4 |
| 18 | Matheus Leist | #4, A.J. Foyt Enterprises, Chevrolet | 19 | +1 |
| 19 | Jordan King | #20, Ed Carpenter Racing, Chevrolet | 18 | -1 |
| 20 | Gabby Chaves | #88, Harding Racing, Chevrolet | 21 | +1 |
| 21 | Max Chilton | #59, Carlin Motorsport, Chevrolet | 20 | -1 |
Biggest Movers
Up: Takuma Sato (+6)
Down: Zach Veach (-4)
Formulated rankings predictions for after next race
The calculation used to calculate the formulated IndyCar Driver Road and Street Course Power Rankings predicts that after the next race at Sonoma Raceway, the IndyCar Grand Prix of Sonoma, this is what the formulated set of rankings will look like.
| Formulated Rankings Predictions |
| 1st – Scott Dixon (-) |
| 2nd – Josef Newgarden (+3) |
| 3rd – Ryan Hunter-Reay (-1) |
| 4th – Robert Wickens (-1) |
| 5th – Alexander Rossi (-1) |
| 6th – Simon Pagenaud (-) |
| 7th – Sebastien Bourdais (-) |
| 8th – James Hinchcliffe (+2) |
| 9th – Takuma Sato (-) |
| 10th – Marco Andretti (+2) |
| 11th – Tony Kanaan (+2) |
| 12th – Graham Rahal (-1) |
| 13th – Will Power (-5) |
| 14th – Spencer Pigot (+2) |
| 15th – Ed Jones (-1) |
| 16th – Charlie Kimball (-1) |
| 17th – Zach Veach (-) |
| 18th – Matheus Leist (+1) |
| 19th – Jordan King (-1) |
| 20th – Max Chilton (-) |
| 21st – Gabby Chaves (-) |