this is the second time I have driven from western Montana to SE Minnesota, did it the same time last year as well. drove in Montana, North Dakota, South Dakota, Minnesota, Wisconsin and Wyoming and this year like last year the worst mpg was on Minnesota gas. you would think that it would be best as slower speed limits and flat. Best was Montana and Wyoming, two hilly high speed limit places. cheapest gas was wyoming you can get non ethanol 91 for $4.59 and 87 for $3.99.
