moire76, recommend replacing the distributor cap, distributor rotor and ignition wires with Bosch parts unless you know they have been replaced within the last 30,000 miles. Hopefully you used the spark plugs specified in the Owner's Manual with the gap set properly. Make sure the tires are inflated properly ... even a few psi over the values shown on the fuel filler flap. If those things don't improve the gas mileage then there's a chance the cylinder compression values are low, resulting in low gas mileage. There's always a reason folks are selling a vehicle that appears flawless.

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Fred Hoelzle