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My wife has a 1994 Astro RWD and a very heavy right foot. I keep track of the fuel consumption for her van and my BMW. Here is a copy of her chart for the few months we have owned it. These are a mix of city/highway driving kilometers.
km litres $/litre L/100km US MPG
505 88.955 0.719 17.6 13.4
586 88.000 0.635 15 15.7
563 88.021 0.699 15.6 15
591 94.000 0.699 15.9 14.8
259 39.966 0.658 15.4 15.2
You need to get the engine checked for fault codes. Maybe a faulty temperature sensor or MAP sensor. Sounds like yours is a little thirsty. These things are pigs. Or maybe you drive in the snow a lot and the tires are spinning!
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