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I’m an engineer, so I love data. I’ve always heard there’s no appreciable benefit in running premium versus regular gas. A few years ago when I ran across premium at a discounted price, I decided to try an experiment. I track my gas mileage so I know what MPG I get for regular. I decided to run 10 tankfuls of premium gas and compare my gas mileage. Not only did I notice an improvement in acceleration but my MPG improved 9%. So whenever I can buy premium at a price not higher than 10% above the cost of regular gas I buy it.
Now back to UNL88.....can anyone tell me what engine change took place between 2000 and 2001 that determined the cutoff for who can and can’t use UNL88?
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I’m an engineer, so I love data. I’ve always heard there’s no appreciable benefit in running premium versus regular gas. A few years ago when I ran across premium at a discounted price, I decided to try an experiment. I track my gas mileage so I know what MPG I get for regular. I decided to run 10 tankfuls of premium gas and compare my gas mileage. Not only did I notice an improvement in acceleration but my MPG improved 9%. So whenever I can buy premium at a price not higher than 10% above the cost of regular gas I buy it.
Now back to UNL88.....can anyone tell me what engine change took place between 2000 and 2001 that determined the cutoff for who can and can’t use UNL88?
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In the upper Midwest Unleaded-88 has 15 percent ethanol compared to 10 percent in the Unleaded-87 and 89, that's what is listed on the pump anyway. They add ethanol in the winter because the vehicles are using more fuel in the colder weather. It could be in the fuel all year who really knows. Premium has some ethanol in it but we also have Ethanol free Premium but it is more expensive.I’m an engineer, so I love data. I’ve always heard there’s no appreciable benefit in running premium versus regular gas. A few years ago when I ran across premium at a discounted price, I decided to try an experiment. I track my gas mileage so I know what MPG I get for regular. I decided to run 10 tankfuls of premium gas and compare my gas mileage. Not only did I notice an improvement in acceleration but my MPG improved 9%. So whenever I can buy premium at a price not higher than 10% above the cost of regular gas I buy it.
Now back to UNL88.....can anyone tell me what engine change took place between 2000 and 2001 that determined the cutoff for who can and can’t use UNL88?
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I use the''88'' because its cheaper but it has more Ethanol in it than the 87 octane. It is not available at all stations just a few. I do not notice any difference in power and don't compare mileage because I don't really put on that many miles.It's fine as long as you don't drive it under heavy load (hard throttle, high temps, towing, etc.). LS engines, especially the Gen4 and newer, tend to benefit from 89 or higher even though the manual specifies that minimum 87 octane is ok. I can hear and feel a difference in mine with the different grades and usually run 93 because I like acceleration and the temps are often in the 80s-90s most of the year.
I have been running it in my '00 Yukon when its available and the truck runs fine.Can anyone tell me if it’s ok to run UNL88 has in a 2001 Yukon with a 5.3L engine?
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