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99 UK S-turbo
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8,148 Posts
Air filter doesn't effect FE on an EFI, that's an old carb issue.

Lots of condensation is normal, I've always had to use the rear wiper to clear it in cold weather!

Running rich/02 sensor is a possibility, as is the fact its been especially cold, so more cold running, colder thicker oil, lots of heating (slowing engine warm up)/heated rear window/bum warmers (if fitted) etc all affect FE.

Simon
 

· Registered
99 UK S-turbo
Joined
·
8,148 Posts
I'm running 0W30 edge and got an economy improvement of about 3-4%.....

Simon
 
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