| [GMCnet] Premium grade fuels [message #339829] |
Sun, 30 December 2018 11:58  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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At our last GMCMI event. While setting at the liars table. I got in on the end of their discussion on premium fuels. Their thought was that it was better. But what does the term better mean? In the last 16 years with our GMC. I've only used regular gas that was rated as 87 octane. Was wet, and it burned. Never cared if it had Ethanal in it. ( This isn't an Ethanal discussion. )Never had issues with it. Got gas yesterday at $1.79 a gal here in Iowa. Premium was at $2.59. That's a big difference in cost. So what do you get for the extra cash. Premium is higher in octane. Generally at 89 octane. Octane helps to prevent pre detonation in the engines combustion chamber. Commonly called ping. Or knock. And this knock can take out the tops of piston/rings. Gasoline formulations have changed over the years. Just aren't meant to be atomized by way of a carburetor. The carb left the stage in 1988 for the most part. With EFI systems that have spark control, and a knock sensor. Like the GM Howell. 89 octane gas just isn't needed as a precaution to avoid knock. Save that $70 cents a gal. Get an EFI with a knock sensor for engine safety. And that's really where the MPG improvement is. Bob Dunahugh 78 403 Royale
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