One thing not mentioned so far is the use of high pressure fuel pumps for common-rail injection petrol engines. This used to be something you only found on diesels. The lubricity of diesel fuel is a factor in the design and longevity of the high pressure (~1000s PSI) pump.
Some models (eg. E90 BMW 335i) suffered from early high pressure fuel pump (HPFP) failures in the US. It would be interesting to find out if there's any hard data on this (I imagine it'll be closely guarded by the manufacturers) but I'd suspect ethanol in the fuel as a factor - ethanol is even less of a lubricant than petrol and the HPFP may well suffer additional friction as a result.
Some models (eg. E90 BMW 335i) suffered from early high pressure fuel pump (HPFP) failures in the US. It would be interesting to find out if there's any hard data on this (I imagine it'll be closely guarded by the manufacturers) but I'd suspect ethanol in the fuel as a factor - ethanol is even less of a lubricant than petrol and the HPFP may well suffer additional friction as a result.