Gas octane at higher elevations
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Gas octane at higher elevations
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May 3 2013, 12:59 PM
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Club Newbie Group: Members Posts: 23 Posts Per Day: 0.01 Thanks Received: 3 Trader Stats: 0 (0%) Joined: 11-October 11 Member No.: 11,284 |
I noticed most of the gas stations in Colorado sell 85 or 85.5 octane gas and call it regular. I live at 6,200 feet and am wondering if the 85 or 85.5 is safe for the Elantra?
-------------------- A proud member of the club.
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May 3 2013, 08:51 PM
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Club Newbie Group: Members Posts: 8 Posts Per Day: 0.00 Thanks Received: 1 Trader Stats: 0 (0%) Joined: 25-April 13 Member No.: 15,475 |
One mile high => less air compare to sea level => engine sucks in less air and thus has less compression => no knocking when using 85 octane. If you're really worried, put in 1/2 of 85 octane and 1/2 of 89 octane, but that's a waste of money in my book.
-------------------- A proud member of the club.
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May 3 2013, 10:12 PM
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Club Newbie Group: Members Posts: 23 Posts Per Day: 0.01 Thanks Received: 3 Trader Stats: 0 (0%) Joined: 11-October 11 Member No.: 11,284 |
Really a waste considering all the pumps sell 87 as well:)
-------------------- A proud member of the club.
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May 4 2013, 11:11 AM
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Sleep is for the weak! Group: Leader Posts: 2,999 Posts Per Day: 0.43 Thanks Received: 197 Trader Stats: 8 (100%) Joined: 2-February 05 From: New Jersey Member No.: 250 Mood: Stressed |
I would stick with 87 to be safe.
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May 6 2013, 10:51 AM
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Club Newbie Group: Members Posts: 48 Posts Per Day: 0.01 Thanks Received: 12 Trader Stats: 0 (0%) Joined: 16-August 12 From: Denver, Colorado Member No.: 13,380 Mood: Calm |
You can do it, as sspak9 says, because of the altitude. That said, I know my MD definitely gets 1-2mpg more efficiency with the higher octane (might be the intake/exhaust mods at work there?)- I always just drop the extra 3 bucks and get the 91 instead of the 85/87.
-------------------- 2013 Hyundai Elantra Limited
w/ K&N 69-Series Typhoon CAI & Flowmaster 40 Series Original Check out the car in my Garage- http://www.elantraclub.com/forum/index.php...tem&CID=613 |
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Jun 19 2013, 12:18 PM
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Club Newbie Group: Members Posts: 23 Posts Per Day: 0.01 Thanks Received: 3 Trader Stats: 0 (0%) Joined: 11-October 11 Member No.: 11,284 |
Switched to 85 after my last post. No knocking and gas mileage actually went up. Averaging about 32 mpg running about 60% highway and 40% town.
Definitely note the loss of hp compared to sea level. Lose about 3% for each 1,000 of elevation so that puts me down about 20% since our new house is at 7,000 feet. This post has been edited by randyb: Jun 19 2013, 12:21 PM -------------------- A proud member of the club.
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1 members thank randyb for this post litesong | |
Jun 19 2013, 12:28 PM
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Sleep is for the weak! Group: Leader Posts: 2,999 Posts Per Day: 0.43 Thanks Received: 197 Trader Stats: 8 (100%) Joined: 2-February 05 From: New Jersey Member No.: 250 Mood: Stressed |
Yeah I definitely noticed a big loss of hp after moving to VA. It really is rough when I'm carting around carload of people. Then when I get back down to sea level I feel like I'm driving a race car.
-------------------- A proud member of the club.
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Jul 6 2013, 08:57 PM
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Club Newbie Group: Members Posts: 23 Posts Per Day: 0.01 Thanks Received: 3 Trader Stats: 0 (0%) Joined: 11-October 11 Member No.: 11,284 |
Car is finally getting good mpg's. Last 5 tanks of 85 and we averaged between 34.5 to 35 mpg. Driving consists of 75% highway and 25% city. Maybe after 23,000 miles it is broken in.
This post has been edited by randyb: Jul 6 2013, 08:59 PM -------------------- A proud member of the club.
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1 members thank randyb for this post roydjt | |
Jul 30 2013, 11:57 AM
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Club Regular Group: Banned Posts: 119 Posts Per Day: 0.03 Thanks Received: 8 Trader Stats: 0 (0%) Joined: 24-July 12 From: Everett, WA Member No.: 13,201 Mood: Accomplished |
Switched to 85 after my last post. No knocking and gas mileage actually went up. Averaging about 32 mpg running about 60% highway and 40% town. Definitely note the loss of hp compared to sea level. Lose about 3% for each 1,000 of elevation so that puts me down about 20% since our new house is at 7,000 feet. Thank you for the great news about 85 octane gasoline for higher altitudes. Suspect you have lots of elevation gains & loses at your mountainous region, which may reduce your mpg. Some of my best mpg has come at high altitudes, but on relatively level high plains. 85 octane will cause no damage & is in sync with the higher altitude. I have plans to take an extra two 5 gallon containers with me so I can reach high altitude 100% gasoline stations(no ethanol), which also pump 85 octane. I love to support stations that sell 100% gasoline & in this case, also sell 85 octane. Using 100% gasoline, I average 39mpg, with a high of 43mpg. I do wonder tho, how low will the 85 octane perform properly. I might think, careful driving should allow 85 octane to perform OK down to what.....2000 feet? -------------------- A proud member of the club.
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