Lower octane at high altitude
WebNov 7, 2014 · On a normally aspirated engine one can run lower octane the higher altitude. That is why in Denver regular gas might be 85 but at lower altitudes it might be 87. Question is, the X3 3.5 requires 91 octane. If the car is run normally above 5,000 ft. could one drop down to mid grade 89 octane? WebNov 17, 2024 · What is octane? In recent years, car manufacturers have been requiring or recommending premium gasoline (a high-octane grade of fuel) for use in more of their …
Lower octane at high altitude
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WebJan 16, 2011 · Less octane is required at elevation because at higher elevations there is less barametric pressure. Standard pressure is 14.6 psi at sea level, around 11k feet that is closer to 10 psi. As elevation goes up, pressure goes down. So your motor has less compression at say 10k feet than it does at sea level, everything else equal. WebJan 4, 2024 · Using a lower rating could lead to knocking and other engine problems. Whether 85 octane gas pollutes more than 87 octane is less clear. The Coordinating …
WebAccording to this article from AAA, the stated reason is that most of Colorado is at high elevation, above 5000 feet (about 1500 meters), and the thinner air tends to prevent detonation. Therefore, in theory, one can use the cheaper, lower octane fuel without … WebFuel system: A lower octane level of fuel is required at higher altitudes, since there isn’t enough oxygen per volume of air to take advantage of high-octane fuels. If you fill up at a …
WebMay 1, 2016 · #1 Hi all: I live at 5000+ ft above sea level. My manual for my 2015 Corolla specifies 87 octane and has no comment for high altitude conditions (unlike the manual for my Nissan). I thought that one can and should use a lower octane at higher altitudes but I also know if most cases the manual "wins". Thanks for any input. mclasser Joined WebFuel octane rating at high altitude. Now I have read the manual (p.557) that says the minimum recommended octane rating is 87 to avoid engine knocking. However, in high altitudes places such as Denver, the regular gasoline is 85 octane rating. In Texas regular is 87 which becomes midgrade in Colorado. A few articles say 85 is 87 in high ...
WebLower octane at high altitude? Probably a dumb question. I just moved from North Carolina to Colorado and was pretty surprised to find 85, 87, and 91 octane at all the gas stations rather than the 87, 89, 93 I'm accustomed to... and of course the 87 is about 30 to 50 cents more a gallon than the 85.
WebAug 28, 2016 · 85 octane is fine in higher altitude areas. I've seen 85 octane in Amarillo, TX which is not what I'd consider 'high altitude'. One thing I've noticed about running my vehicles in high altitudes is my greatly improved fuel economy. Less dense and drier air must be the reason. I've seen MPG jumps as much as 5-8mpg higher when driving in the ... assassimio marvelWebJul 31, 2024 · If I'm traveling out of state to lower elevation, I fill up with 87 before leaving. The switchover (going east) to 87 octane occurs shortly after the Kansas border, around 4000-4500 ft. elevation. ammolab Joined Jan 16, 2006 Messages 1,821 Location Ruidoso, NM USA Jul 23, 2024 #11 Originally Posted by Kestas assassi luyWebJul 8, 2024 · The reason for lower octane rating at altitude is because at higher altitude the atmospheric pressure is less, so there is less oxygen in each intake charge at full throttle. Combustion temperature and pressure is correspondingly lower. Octane rating is a measure of a fuel's resistance to pre-ignite, or knock (or prematurely explode) at full ... assassimio onlineWebAug 23, 2024 · Car Guides Auto Q&A: Higher altitude calls for lower octane Nearly all cars can run on a lower octane at high elevations. The lower octane fuel (usually regular grade) is usually 100 percent ... lamaingeoiseWebOctane, as a measurement is indeed affected by altitude and air density. 87 octane at California sea level is equivalent to 83 octane in the mile-high state of Colorado. This is also why cars are slower at higher altitudes, world record … la main anatomie humaineWebFuel system: A lower octane level of fuel is required at higher altitudes, since there isn’t enough oxygen per volume of air to take advantage of high-octane fuels. If you fill up at a high altitude and return to your lower elevation later, you may suffer from engine sputtering and a lack of power. la main filmWebMar 20, 2015 · NOTE: In some high-altitude areas—usually over 5000 feet elevation—85-octane gas is also available. This is because there’s less oxygen in the air at high altitudes, and since oxygen is what mixes with … la main en allemand