But the European Commission's chief negotiator, Artur Runge-Metzger, said the EU favoured tighter rules.

BBC: Rich countries accused of carbon 'cheating'

"The data does not support Firestone's contention that Explorers stand out from other SUVs with respect to its handling characteristics following a tread separation, " said NHTSA Administrator Jeffrey Runge.

BBC: US drops Explorer tyre probe

"Under our proposal, every pickup, SUV and minivan purchaser will benefit by buying vehicles that are as fuel-efficient as possible, regardless of who makes it or how big it is, " said National Highway Traffic Safety Administrator Jeffrey Runge in a statement.

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