Type of Gas - Cadillac XT4 Forum
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post #1 of 8 (permalink) Old 05-27-2019, 08:27 AM Thread Starter
Ash
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Type of Gas

Is XT4 run on regular (87) gas?
Any owner is using regular gas?
As per owner's manual it can run on regular gas but you will loose mileage and performance.
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post #2 of 8 (permalink) Old 05-27-2019, 10:12 AM
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You decide what use you give the new XT4 and how much are you willing to pay. All of my GM vehicles use regular gasoline, yet one of them (1995 Buick Regal Limited with 3.8 L V6) was a great performer, running at 55 MPH at just 1700 RPM. During the annual inspection, its idle was as low as 650 RPM, and the examiner thought his equipment was in error! I sold the Regal after 21 years of service, and the new owner is still happy with it even as late as last month.

I never had to use premium fuel since GM engines are very advanced in detecting any knocking and never had trouble with them. So if you want to get the best cost/performance ratio, just use regular fuel, drive smoothly, save money, and get a very long engine life.
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post #3 of 8 (permalink) Old 05-29-2019, 09:23 PM
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The manual states that it is "Recommended" to use Premium fuel. Yes once in awhile you can use regular gas but here is what I calculated out the difference if premium gas is .30 cents a gallon more.

I filled up after one week's driving and I used 14 gallons. So .30 x 14 = $4.20 wk X 52 = $218.40 a year. So is spending $218.40 a year more for better performance and better gas mileage worth the added expense??

Answer for me is YES!
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post #4 of 8 (permalink) Old 06-03-2019, 11:10 AM
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It is your money!
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post #5 of 8 (permalink) Old 06-06-2019, 03:25 PM
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Quote:
Originally Posted by Marc NY View Post
The manual states that it is "Recommended" to use Premium fuel. Yes once in awhile you can use regular gas but here is what I calculated out the difference if premium gas is .30 cents a gallon more.

I filled up after one week's driving and I used 14 gallons. So .30 x 14 = $4.20 wk X 52 = $218.40 a year. So is spending $218.40 a year more for better performance and better gas mileage worth the added expense??

Answer for me is YES!
Some of us prefer more spirited driving and for that reason alone better fuel makes all the difference. Experienced that myself with previous vehicles.
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post #6 of 8 (permalink) Old 06-12-2019, 10:40 AM
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Garage
Seriously. I use regular gas and am blown away with the performance on my XT4. I don't think the increased performance using premium is needed.
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post #7 of 8 (permalink) Old 08-16-2019, 06:25 PM
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To boil down Marc numbers even further, it comes down to 60 cents a day. Come on how cheap can one be for a 50k car? With less than 93 octane you may experience engine knock which will damage the engine. Why would you take that chance unless it's a 2 yr lease you would pass on to someone else. I prefer better performance, better fuel economy and protecting the engine in the long run.
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post #8 of 8 (permalink) Old 08-21-2019, 06:05 PM
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Where did you see that anything other than 93 was acceptable to use? I looked in my manual as I would like to use 87 also
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