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Just thought of another idea, which is to significantly increase the EGR.
Basically replace the oxygen going into the engine with the exhaust gas,
this would decrease engine power and reduce the fuel used (assuming the EFI would adjust properly). Again, not a trivial effort, but wouldn't be costly if you can DIY.
I do agree that replacing the car is a no-brainer. But these ideas apply to newer cars too.
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