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Since winter is approaching, I can offer a bit more on using a radiator blocker. I use a piece of 1/4" plywood with several 4" diameter holes in it. The rad is at least 70% blocked. The holes are located such that the electric fans will pull through them. This works to limit the amount of air passing through the engine compartment. The engine warms up much more quickly. The remaining rad area is more than sufficient to cool the engine in cold temperatures. A side benefit is you get heat from the heater faster.
One other tip - Terrain. If you have a choice between a hilly route and a flat one the flat one will use less fuel.
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