SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Technology Stocks : Automobile technology and business management
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10PreviousNext  
From: Arthur Tang8/6/2012 6:17:40 AM
of 44
 
Gasoline formulation since 1993 has been changed to steam driven thru combustion cycle. Meaning the water in the gasoline expanded during ignition cycle to drive the piston thru its power cycle. Compression ratio of the new aluminum engines are 9-10:1. So higher octane gas will give more torque with faster combustion of higher octane rating.

The way gasoline is made, 87 octane is achieved for regular gas. Then mtbe is added for higher octane. MTBE burns fast adding torque while combusting. This makes better mpg if you travel in the hills. Or on level ground more torgue move your car with less rpm in overdrive(coasting). Highest octane can improve torque 4%. But the car can run at less rpm will save gas quite dramatic. As much as 10 mpg improvement can be expected on certain cars on highway traveling 80 mph(maximum torque vs rpm). 65 mph runs too slow a rpm for maximum torque for certain car design, to overcome hills On small cars with 4 cylinders maximum torque occurs at 3500 rpm for best octane performance in mpg. In city driving, higher octane will benefit running engine between 2000-3000 rpm and let overdrive do more coasting. Watch your overdrive rpm when you let go the accelerator.

So, octane rating of gasoline can save gas. if you drive differently. Using premium gas of 93 octane may work for your small car for maximum gas savings?

On computers in the car which regulates the shifting points of gears in automatic transmission, you can reset the economical mpg setting by switching on the battery and hold the accelerator down for more than 5 seconds. For more aggressive driving performance you press down for more than 30 seconds. These are preset performance programmed at the factory(Bentley method).
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News