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Still using "per fill up" term....take the mileage you have and divide it by the amount of gas you just pumped into the car. That will give you an accurate MPG. Are you driving the car harder? How many miles on it? Did you read the thread before you posted? Could be fuel filter or spark plugs need replacing.
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2002 3400 & 3500 GL "Ruby"-->R.I.P. 163k. My first car. Put 130k on her.
2000 3500 GLS "Robin"-->Intake,Headers,Exhaust,H&R springs,KYB AGX,Sway bars,Strut bars and more 
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