21.   Even though Penske has tested the engine over such a distance, the answer will not be known until race day.

v. + engine >>共 326
start 8.04%
use 4.31%
build 3.02%
have 2.96%
rev 2.38%
damage 2.38%
cut 2.32%
make 2.19%
supply 1.93%
gun 1.93%
test 1.35%
test + n. >>共 1571
water 2.77%
drug 2.34%
system 2.31%
theory 2.05%
sample 1.80%
product 1.63%
limit 1.50%
idea 1.17%
missile 1.07%
device 1.07%
engine 0.30%
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