Re: fuel
Is octane really mesured differently?
The octane number just shows the ratio of n-heptane (0 octane) and 2,2,4-trimethyl-pentane (100 octane). It means a probe of gas with 90 octane equals a mixture of 90% 2,2,4-trimethyl-pentane and 10% heptane.
These tests are made in a standardized motor.