The mileage on my 1986 B2000 ( 140,000 miles) varies considerably. I have gotten as much as 650 km (400 mi) and as little as 400. I've discovered that mileage is much better in the summer than winter and I believe the reason is directly attributable to avoiding vacuum leaks, maintaining the careburator, good cooling system, good SP wires etc. The higher ambient temperatures in summer will increase the vapor pressure of the gas and in my case provides a better fuel/air mixture. Lately my engine is running cooler than usual and not getting the 550 km I'm accustomed to and may need a new thermostat to increase the operating temperature but as long as I am getting good mileage I'm not too concerned.
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