Conor Daly was fastest overall but it was Ed Jones again setting the non-tow pace on the final day before qualifying for the Indianapolis 500 begins.
Daly set a 38.8426s (231.704mph, 372.891km/h) on his 54th lap in the #25 Andretti Autosport Honda to usurp team-mate Marco Andretti (#98 Andretti Herta w/ Marco & Curb-Agajanian Honda), who clocked his best of 38.9862s (230.851mph, 371.519km/h) on his second lap of Day 4 of practice.
Second through ninth were covered by less than a tenth of a second with the top 12 all setting a lap at an average speed exceeding 230mph, as turbos were turned up to 1.4 bar in preparation for qualifying.
Rounding out the top five were 2017 race winner Takuma Sato (#30 Rahal Letterman Lanigan Honda), Spencer Pigot (#21 Ed Carpenter Racing Chevrolet), and Ryan Hunter-Reay (#38 Andretti Autosport Honda).
Will Power (#12 Team Penske Chevrolet) was 11th, Scott Dixon (#9 Chip Ganassi Racing Honda) was 16th, and James Davison (#33 DCR w/ Byrd-Hollinger-Belardi Honda) was 23rd.
Having missed the day prior as McLaren Racing built up a spare chassis, Fernando Alonso put the #66 Chevrolet into 24th position.
In terms of non-towed laps, Jones remained the pace-setter with a 230.106mph (370.320km/h) effort in the #63 Ed Carpenter Racing Chevrolet, just ahead of Ed Carpenter himself (#20 Chevrolet) at 229.879mph (369.954km/h).
Power was fourth fastest on non-tows, Dixon eighth, Davison 20th, and Alonso 30th.
Kyle Kaiser produced the day’s major incident when he clouted the wall at Turn 3 in the #32 Juncos Racing Chevrolet, although the 22-year-old was thankfully uninjured.
“This is not what you want to be doing on the day before (#Indy500) qualifying.”
Kyle Kaiser is OK after this crash in practice, but the team faces a major setback as it tries to make the field of 33. Watch on @NBCSportsGold: https://t.co/PqVUeFoq4g#MustBeMay pic.twitter.com/esjN3F8z2V
— IndyCar on NBC (@IndyCaronNBC) May 17, 2019
Graham Rahal would later get away with a touch of the wall exiting Turn 1 in the #15 Rahal Letterman Lanigan Honda.
Just a little #INDYCAR // #ThisIsMay pic.twitter.com/GfJCvSWX9W
— NTT IndyCar Series (@IndyCar) May 17, 2019
Practice resumes tonight at 0800 local time (2200 AEST), leading into the first day of qualifying under the new-for-2019 format.
Results: Practice: Day 4
| Pos | Num | Driver | C/E/T | Time | Avg speed | Laps | |
| mph | km/h | ||||||
| 1 | 25 | Conor Daly | D/H/F | 0:38.8426 | 231.704 | 372.891 | 57 |
| 2 | 98 | Marco Andretti | D/H/F | 0:38.9862 | 230.851 | 371.519 | 42 |
| 3 | 30 | Takuma Sato | D/H/F | 0:39.0024 | 230.755 | 371.364 | 54 |
| 4 | 21 | Spencer Pigot | D/C/F | 0:39.0504 | 230.471 | 370.907 | 25 |
| 5 | 28 | Ryan Hunter-Reay | D/H/F | 0:39.0513 | 230.466 | 370.899 | 43 |
| 6 | 20 | Ed Carpenter | D/C/F | 0:39.0696 | 230.358 | 370.725 | 26 |
| 7 | 22 | Simon Pagenaud | D/C/F | 0:39.0750 | 230.326 | 370.674 | 15 |
| 8 | 23 | Charlie Kimball | D/C/F | 0:39.0812 | 230.290 | 370.616 | 36 |
| 9 | 2 | Josef Newgarden | D/C/F | 0:39.0827 | 230.281 | 370.601 | 42 |
| 10 | 63 | Ed Jones | D/C/F | 0:39.1124 | 230.106 | 370.320 | 17 |
| 11 | 12 | Will Power | D/C/F | 0:39.1200 | 230.061 | 370.247 | 38 |
| 12 | 14 | Tony Kanaan | D/C/F | 0:39.1285 | 230.011 | 370.167 | 21 |
| 13 | 24 | Sage Karam | D/C/F | 0:39.1420 | 229.932 | 370.040 | 43 |
| 14 | 27 | Alexander Rossi | D/H/F | 0:39.1512 | 229.878 | 369.953 | 46 |
| 15 | 18 | Sebastien Bourdais | D/H/F | 0:39.1527 | 229.869 | 369.938 | 50 |
| 16 | 9 | Scott Dixon | D/H/F | 0:39.1562 | 229.849 | 369.906 | 54 |
| 17 | 26 | Zach Veach | D/H/F | 0:39.1627 | 229.811 | 369.845 | 48 |
| 18 | 3 | Helio Castroneves | D/C/F | 0:39.1838 | 229.687 | 369.645 | 49 |
| 19 | 19 | Santino Ferrucci (R) | D/H/F | 0:39.2025 | 229.577 | 369.468 | 30 |
| 20 | 7 | Marcus Ericsson (R) | D/H/F | 0:39.2137 | 229.512 | 369.364 | 39 |
| 21 | 60 | Jack Harvey | D/H/F | 0:39.2215 | 229.466 | 369.290 | 44 |
| 22 | 15 | Graham Rahal | D/H/F | 0:39.2244 | 229.449 | 369.262 | 41 |
| 23 | 33 | James Davison | D/H/F | 0:39.2380 | 229.369 | 369.134 | 34 |
| 24 | 66 | Fernando Alonso | D/C/F | 0:39.2451 | 229.328 | 369.068 | 77 |
| 25 | 88 | Colton Herta (R) | D/H/F | 0:39.2852 | 229.094 | 368.691 | 26 |
| 26 | 48 | JR Hildebrand | D/C/F | 0:39.3458 | 228.741 | 368.123 | 29 |
| 27 | 4 | Matheus Leist | D/C/F | 0:39.3590 | 228.664 | 367.999 | 34 |
| 28 | 77 | Oriol Servia | D/H/F | 0:39.3736 | 228.580 | 367.864 | 47 |
| 29 | 5 | James Hinchcliffe | D/H/F | 0:39.3770 | 228.560 | 367.832 | 51 |
| 30 | 10 | Felix Rosenqvist (R) | D/H/F | 0:39.3927 | 228.469 | 367.685 | 64 |
| 31 | 39 | Pippa Mann | D/C/F | 0:39.4272 | 228.269 | 367.363 | 38 |
| 32 | 42 | Jordan King (R) | D/H/F | 0:39.4658 | 228.046 | 367.004 | 56 |
| 33 | 59 | Max Chilton | D/C/F | 0:39.5470 | 227.577 | 366.250 | 51 |
| 34 | 31 | Patricio O’Ward (R) | D/C/F | 0:39.5581 | 227.513 | 366.147 | 38 |
| 35 | 81 | Ben Hanley (R) | D/C/F | 0:39.7059 | 226.667 | 364.785 | 81 |
| 36 | 24 | JR Hildebrand | D/C/F | 0:39.7284 | 226.538 | 364.578 | 5 |
| 37 | 32 | Kyle Kaiser | D/C/F | 1:09.3212 | 129.830 | 208.941 | 1 |
(C)hassis: D=Dallara | (E)ngine: C=Chevy, H=Honda | (T)yre: F=Firestone
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