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Whisk the flours, sugar and salt in a large bowl.
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With your fingers, quickly rub butter into the dry ingredients until the pieces are smaller in size but still visible.
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Add sour cream and oil and toss with a fork to combine.
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Sprinkle water over the mixture and toss with a fork until evenly moist.
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Knead the dough in the bowl a few times -- the mixture will still be a little crumbly. Turn onto a lightly floured surface and knead a few more times, until the dough just holds together.
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Shape into a circle approximately 5 inches around, wrap in plastic, and refrigerate for 1 hour.
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Remove the dough from the refrigerator; let stand for 5 minutes to warm slightly.
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Roll between sheets of parchment or wax paper into a 13-inch circle.
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Peel off the top sheet and invert the dough into a 9-inch pie pan.
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Peel off the remaining paper.
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Trim the crust so it overhangs the edge of the pan evenly (you can use kitchen shears or a butter knife).
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Tuck the overhanging crust under, forming a double-thick edge.
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Using your fingers, flute the edge.
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Proceed with your favourite pumpkin pie recipe.