No,its not a trick. Some cars really do need premium. Some cars will "ping" if they require premium and you use regular. The premium burns at a higher temp which come engines require. My dads MX-6 V6 will act funny without premium.
Most cars of newer years can run on regular due to knock sensors and such. If your dad is running 87 octane, the ECM likely detects it and retards the spark advance in the Jag. However, the Jag will likely run better (not saying it isn't) with the 91 - higher octanes, but should be fine with the fuel he puts in it.I have been wondering this question for a long time and it is .....
Is premium and unleaded just a PHSYCOLOGICAL (i think i spelled it right) TRICK by the government???
Because my dads 2003 jag xj8 needs premium but he puts regular gas in and it runs just fine and it's been 2 years now and he still has not put premium back in.
But i'm wondering because i have a 96 caddy deville and i need premium so it would be great if i could save money on gas.
I'm alright, just putting up with some God-aweful politics at work that's preventing me from getting a full promotion...Mike! Good to see you post. It's been a long time it seems. How are you doing buddy? :wavehi:
I'm good. Best day of my life so far. I closed my business just over a year ago, you probably remember. Since then have worked for 4 different contractors in various capacities from basic Journeyman to Project Foreman and Detailer. My last job started out as a 2 week gutter job just before Christmas, it stretched out till 2 weeks ago. That one was interesting, 1R14 at Diablo Canyon Nuclear Power Plant. Worked the night shift through the outage. 7/12'sI'm alright, just putting up with some God-aweful politics at work that's preventing me from getting a full promotion...
If you haven't noticed under my auto ownership, I also traded my '89 Deville in for a '98 Buick Regal, which I actually enjoy driving every time I get behind the wheel, so thats good...
Pretty much spot-on.Octane is nothing more than the fuels ability to resist detonation (knocking), nothing more. It does not burn cleaner, faster, slower, hotter or cooler, nor will it reduce TB cleaning. Carbon build up on the TB comes from EGR and PCV gases. The Northstar has a very effective knock sensor so you can easily burn regular. I did it on my '97 for years and never noticed the difference. If you are going to race it, use premium.