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What fuel do you use?

5K views 20 replies 15 participants last post by  VprGts 
#1 ·
I have a 2014 jeep grand cherokee with a pentastar v6, I've been currently putting 89 (plus). Question is...am I wasting money?
 
#5 ·
I get 372-435 miles (600-700km) a tank out of my Hemi depending on how much highway driving I do. I fill up at Costco @ 1.21/L. I use mainly regular 87 gas that may contain 10% ethanol. Vehicle is usually run at 80km/hr plus most of the time. 8 speed is great.


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#6 ·
I've been told by numerous people to use the gas your vehicle calls for. My last car an Acura called for premium so that's what she got. My 2014 Hemi calls for regular. The computer will adjust itself for the fuel so there is no performance benefit. You just want quality clean fuel.


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#14 ·
You have a 2014 Hemi that specifies regular?

I guess the wording could be interpreted as such.... although the upper end of the range is usually "midgrade" which the OM is silent about.

5.7L Engine — If Equipped
This engine is designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high-quality unleaded gasoline having an octane range of 87 to 89. The manufacturer recommends the use of 89 octane for optimum performance. The use of premium gasoline is not recommended, as it
will not provide any benefit over regular gasoline inthese engines.
 
#8 ·
I use whatever the manufacturer considers recommended. For the Hemi that's 89. While the computers can adjust for 87, they are adjusting from optimum setting.

If I had the V6 I would use 87.

With today's gas mixtures, what GCLimited said is important, go to a high volume station. Gas that sits for long periods loses something.

I was curious when Chevy was running all the Volt commercials with the idiot who said she gassed up so little she couldn't remember where the filler was located. According to Chevy, the Volt stirs/mixes the gas periodically, and if you go too long without getting gas it will run on gas until you get to where you need to add some.


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#10 ·
I figure the engineers are smarter than I am so I go with their recommendations. My Hemi gets the mid grade (89) and up to 21 mpg on the highway. When I first bought it I used regular and then did a mileage test. Got better mileage and performance with the recommended 89. Just my $.02 worth.
 
#11 ·
I use 89 on my hemi and alternate to 91 every other fill up or two. I'll just keep that cycle. i have noticed i get a bit more mpg out of 91.
 
#19 ·
honestly, yes. on a stock tune id run the recommend or one grade better it helps it run smoother. one a aftermarket tune, id shoot for the best fuel possible that's also affordable. meaning if 87 is what you can afford, run that. if you want a tune and can only afford 87, get a better tune for 87.
 
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