An inconclusive investigation was undertaken regarding how RPC-247 was obtained by the dealership.

Wh

RPC-247's fuel tank and containment chamber are to be devoid of all liquids.

"RPC-247's fuel tank and containment chamber must be emptied of all liquids."

All keys to RPC-247 are to be kept in a 4-digit safe outside the containment chamber. No liquids are to make contact with RPC-247 except during testing.

I would re-arrange these sentences

RPC-247 has regenerative properties. If damaged by physical impact or mechanical abuse, the vehicle will be restored to its original state, over time. The regenerative processes is not observable and does not take place under supervision.

"RPC-247 exhibits regenerative qualities; if physically impacted or mechanically abused, it will return to its original condition over a period of time, although the process is not visible and does not occur under observation."

The odometer maintains an accurate reading of RPC-247's mileage; it does not reset during the regeneration process.

"The odometer does not reset during the regeneration process, maintaining an accurate reading of RPC-247's mileage."

RPC-247 has been fueled with various unconventional substances without complications.

I would suggest footnoting or listing in the paragraph what other substances have been used with it.

RPC-247 displays an additional anomalous property when fueled by holy water1, making it incapable of being damaged.

"RPC-247 exhibits an additional anomalous property upon being fueled by holy water, rendering it invulnerable to any form of damage."

97,013 miles (approx. 156,127 kilometers)

RPC uses metric, so kilometers would be listed first instead of miles.

there were no records regarding maintenance or previous sale.

"there were no maintenance or previous sales records."

front right

"front-right"

the authority

Capitalize