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1995 993 Gas Mileage

Engine

Vehicle Information: Year: 1995; Body Type: Coupe; Total Mileage: 71500;

I have a question regarding gas mileage on my 1995 993. Recently, as hot weather has moved into Houston, I've noticed that my gas mileage has dropped off considerably. It's gone from approximately 15-17 mpg in my normal driving (daily commute + weekend romps) to around 11 mpg on my most recent tank of gas. The degradation has been over the last 2 months. I don't use the same station's gas, so I'm doubtful that it's simply related to a bad tank of gas. The thing is that I've noticed no degradation in performance whatsoever - in fact, the car is just singing - it passed a local PCA tech inspection last weekend with flying colors. The car uses no oil at all. I'm not really concerned at this point, but I plan on running a bottle of techron though the next tank. Do you have any insight as to why the fuel consumption might go up so considerably in such a short period of time ?

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