When Driving At High Altitudes The Grades Of Octane Is Er Gas Better For Your Vehicle? Sun Devil Auto
Modern cars adjust the fuel/air mixture and ignition timing based on altitude and temperature. Modern cars adjust for changes in altitude and the driver never notices. The lower octane fuel (usually regular grade) is usually 100 percent gasoline, no ethanol.
Is HigherOctane Gas Better for Your Vehicle? Sun Devil Auto
If you fill up at a high altitude. To maintain the air/fuel ratio, lower octane is acceptable. At higher altitudes, the air is thinner so you can actually get by with a lower octane gasoline.
When driving at high altitudes, the grades of octane for gasoline are indeed reduced compared to the grade of octane available from gasoline retailers located at sea level.
Nearly all cars can run on a lower octane at high elevations. I live at 7000 feet, and i've heard people say don't waste money on premium grades, for stock normally aspirated. They'll also adjust things based on the fuel's octane level, but that means using a lower than. Octane loses 2 points in the transition from sea level to our 5200+ feet here in the denver.
While that might not sound like a problem, if you have a tank at 85 as you start descending. Recent advances in engine technology designed to reduce emissions and improve fuel economy of vehicles at high altitudes could result in minimal octane requirement change with changing. You should be using 89 octane here in co if your car recommends 91 octane. Why is the high octane gasoline not required at high altitudes?
How is Octane Rating Affected In High Altitudes? 034Motorsport FAQ
Past tests of vehicles show that their octane number requirements decrease with altitude.
For instance, regular grade fuel is 87 octane in chicago, but 85 octane in. 85 octane works fine in most normally aspirated engines, fuel injection or carb, at higher altitudes. Ran it for years when i lived there, and still run it when i visit family now. At higher altitudes, the air is less dense.
Motormouth Different octane gas at different elevations?
Lower octane at higher altitudes? BobIsTheOilGuy
Is HigherOctane Gas Better for Your Vehicle? Sun Devil Auto
Higher Octane Better Fuel
