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Porsche 911 Cabriolet (1998-2005) running costs and reliability

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Running costs rating: 3 out of 53.0

Written by Parkers Updated: 10 October 2023

Miles per pound (mpp)

Reliable fuel consumption data for comparison purposes is not available for this model.

What is miles per pound?

Fuel economy

A more stringent standard for fuel economy (WLTP) was introduced from September 2017, and this model was not required to undergo that test. Its fuel economy measured under the previous test system was 19 - 25 mpg. However these figures are less likely to be achievable in real world driving and so should never be compared to another car's mpg which was measured under the newer, more realistic WLTP system.

View mpg & specs for any version

This is a supercar so insurance and fuel costs are fearsome but re-sale values are particularly strong so you’ll recoup money when you come to sell.

911 is a polluting model. With an average of 299 g/km CO2 across the model line-up, its emissions are high for a sports cabriolet. It’s worth noting that the line-up does not feature any diesel models, which typically produce less carbon dioxide than petrol engines with similar power outputs. The range is disappointingly thirsty, averaging 23 mpg.

The most impressive thing about the 911 is that it can take a thorough pasting day after day after day and still remain solid and start on the button. But do not be tempted to forsake the servicing or you’ll decimate reliability as well as resale value..