From an H3 Alpha review:
They also mentioned the FJ is a second quicker 0-60 than the Alpha...that surprised me.Curiously, owners will pay no great penalty in fuel economy for choosing the V8 — at least not compared to the poor economy of the inline-5 version. In mixed driving, we averaged 13.4 mpg in the Alpha. And the observed economy of the original Hummer H3 we tested in 2006? 13.3 mpg.