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You are, I think, on the money. I was running a set of Autolite #64 plugs in my 1985 245 GL with automatic trans. My average mileage was between 21 and 22 M.P.G. I replaced them with a set of Bosch 7900 (WR7DC+) plugs, and the mileage went back up to between 23 and 24 M.P.G.. This car has been maintained in accordance with the service manual for all it's 111,000 miles (It's just a Baby). I have been doing some added maintenance in the last week (wheel bearings, and seals, along with new brake pads)(first set to be replaced). I wish that I had found this forum earlier, because life has been much easier since I stumbled on it. Thanks a million, guys, for all the help that you have given me. My wallet thanks you as well, but the technician at the Volvo Garage is a little worse off since he doesn't get to gouge me any longer. Best of all, performing your own maintinance is fun as well, and as I get to know the different squeaks and moans of the old girl, I can tell what I need to do next.
Bill
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