Heat of combustion for octane

What is the heat of combustion for octane? I can’t find it on google for some reason, and none of my textbooks list heats of combustion for alkanes above pentane. I need a citeable source, but I can’t find anything.

n-Octane: 1302.7 kg calories
CRC Handbook of Chemistry and Physics

Excellent. Thanks.

Actually, what are the units on that value? Is it at 25 degrees C?

The value is for the liquid, at 20°C and atmospheric pressure.