Celsius for day to day purposes and Kelvin for scientific work. However, there are some people who still use the Fahrenheit scale.
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A rate that compares two equivalent measurements is a conversion rate.
The question that you have do asked is, I'm afraid to say, not possible. The two measurements that you have asked about do not measure the same thing. "cc" stands for cubic capacity. It measures capacity. It measures the same as litres. "Mph" measures speed. The two measurements are not interchangeable. Furthermore, one is a metric measurement and one is imperial. They are measurements from different eras of recent history.
There is no real reason for two equivalent measurements to be rationed! The ratio of two equivalent measurements will depend on the units used. The ratio between a length in feet and the equivalent length in inches, for example, is 12:1.
If both sets are in agreement, it is a good indication each is accurate. If, on the other hand, there is great disparity between the two sets, we may conclude there is some significant error in our data gathering or sampling technique. The NASA GISS data (see link) include both a land/sea temperature index and temperature measurements from meteorological stations.
A ratio between two sets of measurements is called a proportion. A proportion is a statement that two ratios are equal. It is often used to compare quantities or values in different contexts, such as in mathematics, science, and finance. The relationship between the two sets of measurements can be expressed using fractions or decimals.