85 octane regular gas mid west states?

No problem in Minnesota and Wisconsin.

You won't have a problem in Illinois or Iowa.

Some mountain states have 85 but still have mid and/or super which will be higher. The thing is, if they sell it, it probably means you're at a high enough elevation that you can use it just fine.

87 may not be the lowest grade on the pump in some areas but you will have an option for 87 or better octane. A little simple math if necessary should keep you around 87 octane. for example the pump may have 85 and 89 octane a fifty fifty mix should suffice

wnjj wrote:
Some mountain states have 85 but still have mid and/or super which will be higher. The thing is, if they sell it, it probably means you're at a high enough elevation that you can use it just fine.

All true.
But IF you are just passing THROUGH the mountains, it is best not to pump in a full tank of 85 if you will be down in the valley again before it's gone.
Put half a tank in......or go for mid-grade.

Bring along some onctane boost just in case.

I live in Colorado and use 85 octane in my 2005 v10 motorhome, 2010 v6 Buick Lacrosse and 2014 v6 Jeep Grand Cherokee. No problems at all.

Probably fine with 85... however I use the next higher grade as my owner's manual says 87 minimum.

Here in Colorado 85 is the same as 87 I believe

Colo Native wrote:
Here in Colorado 85 is the same as 87 I believe

ONLY as long as you STAY at high altitude.
I has something to do with atmospheric pressure and air density.

85 stays 85 no matter what you do.
And when you hit the valley, it's not quite enough.
But not likely to cause a major problem either.