Jeff, I've been running 87 octane in the 3.5L V6 our Journey is equipped with. Local driving is yielding about 18-19 mpg while we average 26 mpg highway. I've used 89 octane on occasion, but haven't noticed a noticable difference in fuel mileage or acceleration.Any feedback on 87 octane v. 89 in the 3.5 litre?
My Journey(s) and DGC or Chrysler T&C all get about the same MOH on the highway, even when pulling a popup trailer. Of course the MPH is lower when pulling the trailer.You'll get pretty similar mileage to your Voyager. I went from a Caravan with the 3.3 to my Journey with the 3.6 and they eat fuel at a pretty similar rate. That being said, my Journey is AWD and that does impact mileage.