I fill it to the top at the same gas station each time, then take the miles driven and divide by the number of gallons I put in until full.
BTW, I don't know who recommended the BWD distributor cap and rotor, but I ordered them along with the a plug wire retainer and coil cover. The coil cover and retainer are factory black, but the cap and rotor were the same gray that the factory rotor was molded in. The picture was black like the stock cap, but the part is actually factory rotor gray. Looks different from stock, but doesn't shout aftermarket part.
