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Out of Spec Reviews did a tow test between the Rivian R1T and the Ford F-150 PowerBoost. Both trucks towed a trailer loaded with a Tesla Model 3 Performance (~7500 pounds) to see how much it would cost to tow.
The costs were much closer than I expected. The F-150 PoweBoost cost them $34.50 in gas while it cost $29.84 to charge the R1T.