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exhaust odor

Engine

Model: 911SC, Year:1982, Mileage:120K, Type of use:Street use only
There is a noticeable gas/exhaust smell in the car when driving (not a fresh gasoline leak odor). The engine was rebuilt aprx 25K ago and everything works fine (oil consumption, start up, idle, acceleration, etc. but gas mileage is 13.5 mpg in suburban driving and maybe 21mpg highway). Has stock set-up (catalytic converter, stock exhaust). This odor is really noticeable in the garage after the car is parked after a drive. The car passed PA's state inspection/exhaust analysis w/flying colors 4K ago. I've had this car ten months; used heater last winter and no extra smell through vents or in car. It's my first air cooled Porsche so don't know if this odor or the extent of it is typical. What to check if anything?

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