Check the owner's manaul or the gas tank fill door to confirm the 2.7T
needs a minimum of 91 Octane fuel. Being a twin turbo engine with knock
sensors, filling up with a lower grade fuel will definitely reduce gas
mileage and performance. Lower octane fuels also increase risk of
clogging up the fuel system as well as increasing emmissions which is
harder on O2 sensors, EGT sensors and all four of the the expensive
catalytic convertors.

What is the vehicle odometer mileage?

Recommend a VAG scan to see if there are O2 sensor or EGT sensor codes.
Failing O2's and EGT Sensors will reduce gas mileage. I replaced both
front O2's at 80K KMs on 2.7T, they are primary feedback to ECU for auto
adjusting A/F mixture. VAG-COM supports tests that can be performed to
check responsiveness of O2s, they can become sluggish with age before
triggering DTCs and CELs.


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K04-S4
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