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A bad O2 sensor can cause high FE and your car is due at 135000km. The fact that the O2 sensor heater is gone is a warning sign that the sensor may be malfunctioning too. Already, without the heater it will put you car in open loop for longer than normal: uses more fuel.
An O2 sensor can be bad and not through a code. Mine was working in reverse a
while back and caused all kinds of strange behaviour including poor mileage so that would be my first suggestion: replace O2 sensors. You can get $ generic ones installed. don't need to get $$$ dealer parts.
The O2 sensors are bolted to your exhaust pipes in front of and behind the catalytic converter. Do em both.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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