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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
The pressure/heat at which fuel combusts is defined by the octane number. The higher the intake heat and compression, the higher you want your octane, to deter pre-detonation (ping).
http://www.carbibles.com/fuel_engine_bible_pg3.html
http://www.hotrodders.com/forum/87-o...nt-202248.html
http://www.chevytalk.org/fusionbb/sh...72/tid/293903/
http://www.pwctoday.com/showthread.php?t=148239
http://forums.anandtech.com/showthread.php?t=2148949
http://www.economist.com/blogs/babba...octane-ratings
"As for those who earnestly believe (and quite a few do) that filling the family Toyota with premium will somehow make it go faster or deliver more miles to the gallon, all one can say is don’t bother. As one wit noted, the only thing it will make run faster is money from your pocket."
Please also remember that 10% ethanol is added to our fuel to get the octane that it says it is at the pump. This means they used poor fuel and added alcohol to get that rating. Use ethanol free whenever you can. Ethanol fuel is known to eat gaskets and diaphragms along the fuel/intake systems. It also gives you worse gas mileage and power. Ethanol is only an enhancement when the engine is both boosted and tuned for the fuel...
Last edited by HitShane; 07-08-2016 at 01:58 AM.
Ha... Love this. Thank you ��
Higher compression engines usually require higher octane to offset the chance or occurrence of knock. OEM recommendations should always be followed anyway, and putting in higher octane fuel than recommended is a waste of $$ unless there's a knock occurring. Many stations in Montana had 85 octane and I never had a problem with that over normal 87.
Top Tier has really nothing to do with Octane, but the containing detergents. I full TT 87 since it's just across street. Some think it's a marketing gimmick, but read up on many non biased tests, and they show to reduce deposits. Here in PDX, the price difference isn't that different, if anything at all, so why not just do it? I like the little bit if reassurance myself. I also throw in a bottle of Lucas fuel treatment every 3000 miles too, can't harm anything.
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HitShane (07-08-2016)
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
HitShane (07-08-2016)
It is... I have found that poor brand fuel here in St. Petersburg, FL performed poor when it's hot out and I can hear the engine working hard. Using a med grade fuel from WaWa or Shell is a huge improvement on both engine response and mileage. The locals know this and many use ethanol free as many stations here have it. When it isn't 115F index out (like today) regular fuel works just fine. Following the Compression scale I was taught in my auto classes though, our engines should be running 89... When your octane isn't high enough the engine senses knock and retards the timing, limiting power and efficiency to protect itself. Any fuel with ethanol in it attracts moisture/water and actually bonds with it, phase shifting and losing Octane. I would always use a higher grade fuel when ethanol is present. Fuel can completely phase shift into little plastic balls that clog you fuel system in as little as 120 days or with exposure to water.
http://www.mossmotors.com/SiteGraphi...s/ethanol.html
http://k-100.com/hot-topics/phase-se...e-10-gasoline/
http://www.lcbamarketing.com/phase_s...hanol_blen.htm
https://www.youtube.com/watch?v=RFkRRMU1sQA
If you really want to get into it, look up the microorganisms eating the ethanol fuel in reserve tanks across the country. They delete the pages every day but if you look you will find them. We were getting bad fuel here for a while from the pan handle. Something was in the tanks breaking down the fuel and it was ruining peoples engines in just the last two years. They sold off the fuel and destroyed the tanks, so they say... I ended up rebuilding an ford escape and my motor bikes carbs a few times from it. Chevron was the culprit.
Last edited by HitShane; 07-08-2016 at 02:33 AM.
The article is originally from A.A.A. , http://newsroom.aaa.com/2016/07/aaa-...created-equal/ , more detailed . Not FOX , only 1 of many that carried it , seen it on local news . It does not state octane , it refers to Top Tier gas . I try to get VALERO a TOP TIER gas . I prefer their 91 due to being non ethanol . The 89 is E5 and the 87 is E10 . The HONDA owners manual recommends TOP TIER to help keep deposits at a minimum and 87 or higher . Not sure if the MIRAGE manual states the same . TOP TIERS are more needed with D.I.. I use 91 ( sometimes 89 w/E5 ) during the warmer weather and 87 w/E10 in cold months . Also treat tank 2 to 3 times a year with 10 > 12 ounce bottle of Chevron Techron with a Top Tier 91 w/o E . I'd use the same routine for a MIRAGE or other vehicle .
Last edited by cinder; 07-08-2016 at 03:00 AM.
HitShane (07-08-2016)
Where I live all we have is 87-89-91 all are E10. Some stations have 89/E-Free... This is it. I found alternating between 89/E10 and 89 E Free gave me the best results from day to day. When it's a cold front for a few days 87 works just fine. I fill up 5 days a week so I can easily tell with this small engine how both fuel and weather impact its performance. When its hot as hell out it runs like crap on reg 87 E10!!! It feels like a car with a clutch that is slipping because the timing is retarded so much the engine just has no torque.
I really wish I could get the Dubai tune on this car as I live in a hot climate. They must have a different tune for that region or it wouldn't have any power at all with the high temps they get lol.
If you want to clean your engine of deposits, then run it to redline a few times
Last edited by HitShane; 07-08-2016 at 02:58 AM.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)
HitShane (07-08-2016)