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The secondary advantage of synthetics is more stable viscosity at low temperatures. Which in a cold climate translates into easier starts & better efficiency but only while the engine is coming up to normal operating temps. The actual fuel economy gain in that scenario would be tiny, though.
It's worth noting that no major motor oil company (that I know of) claims "improved fuel economy" as one of the benefits of its synth motor oils relative to the same weight non-synth.
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