Question Karl, What altitude are you at? and do they oxygenate (spike the gasoline with methanol) the fuel there in ID?
When I had 4165 in CO, in Denver, I could'nt run the winter (oxygenated) 87, I had to use 91. However, I could use the summer brew 87. I could run 85 any time in the mountains (they don't spike the fuel off of the front range).
Personally, I believe oxygenating the fuel drives the cost of gas up more than it reduces emissions. I was an emissions mechanic in Ft. Collins on college and ran many tests for my own edification when business was slow. The only time I saw emissions reduced was after a cold start, before the cats lit off. Granted, I was using just a tailpipe sniffer and not a dyno, but still...
When I had 4165 in CO, in Denver, I could'nt run the winter (oxygenated) 87, I had to use 91. However, I could use the summer brew 87. I could run 85 any time in the mountains (they don't spike the fuel off of the front range).
Personally, I believe oxygenating the fuel drives the cost of gas up more than it reduces emissions. I was an emissions mechanic in Ft. Collins on college and ran many tests for my own edification when business was slow. The only time I saw emissions reduced was after a cold start, before the cats lit off. Granted, I was using just a tailpipe sniffer and not a dyno, but still...
