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2020 Nissan Frontier fuel economy is here. Thanks to a report from Motor1 that we confirmed with Nissan, we know how efficient the Frontier is with its new 3.8-liter V6 and nine-speed automatic transmission. Nissan announced the new engine this year at the Chicago Auto Show, which has turned out to be the last auto show we’ve been able to attend this year due to the coronavirus pandemic. At the show, Nissan promised that this V6-powered Frontier would post better fuel economy figures than the V6 in the 2019 model year truck.