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Old 02-17-2008, 12:32 AM   #1
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gas questions

i was wondering if anyone is running premium gas in their jeeps. my buddy told me i could go faster if i put premium in, but my tank says to only put in unleaded. anyone got any info on this?

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Old 02-17-2008, 12:34 AM   #2
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he said If you use premium you can go faster and maintain the same MPG?

Doubt that for some reason...

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Old 02-17-2008, 02:34 AM   #3
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Premium gas doesnt make you go faster. ALL gas is unleaded. Its illegal to use leaded gas in the US.

Premium gas burns slower, which means that you don't use as much. It also burns cleaner.

Premium is best for every engine, especially for an I6 or a 4banger, regardless of what the manual says.

You will get about a 2mpg increase in fuel economy with premium.
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Old 02-17-2008, 11:09 AM   #4
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is it bad to mix premium and unleaded?
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Old 02-17-2008, 11:11 AM   #5
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Quote:
Originally Posted by cbmedina33 View Post
i was wondering if anyone is running premium gas in their jeeps. my buddy told me i could go faster if i put premium in, but my tank says to only put in unleaded. anyone got any info on this?
Also, put an APC sticker on the window and hold on!!
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Old 02-17-2008, 11:12 AM   #6
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The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.

The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
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Old 02-18-2008, 01:29 AM   #7
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Quote:
Originally Posted by cbmedina33 View Post
is it bad to mix premium and unleaded?
You can add premium to regular, but I don't recommend alternating between the two. If you go the premium route, stay there.
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Old 02-22-2008, 11:18 AM   #8
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Anything with an octane rating higher than needed to prevent pinging is a waste of money.

There are no added horsepower or fuel mileage benefits from an engine that doesn't require it.
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Old 02-22-2008, 11:41 AM   #9
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Originally Posted by rpxr400 View Post
Anything with an octane rating higher than needed to prevent pinging is a waste of money.

There are no added horsepower or fuel mileage benefits from an engine that doesn't require it.
I guess I have to quote myself from an earlier post in this thread...

Higher octane fuel burns SLOWER. A slower burn means BETTER fuel economy.

93 octane enabled me to get 18.6mpg with a faulty carbeurator and a 4.2 I6.
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Old 02-26-2008, 06:07 PM   #10
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I have been running Super in mine and notice a huge difference in low end power between the two. It sucks to pay the extra $, but for me the extra get up and go is worth it with my lift and tires
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Old 03-01-2008, 01:54 AM   #11
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If it does improve your gas mileage is it enough to be worth the extra price?
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Old 03-01-2008, 10:21 AM   #12
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I have always ran the cheapest crap I could find but I am really reconsidering that. Cheaper gas usually causes gunk buildup in your engine which is not good. Other than that, I might switch to better and more expensive gas due to the reaction my backup vehicle has to that. Cheap low Octane gas I usually get less response to the pedal, worse gas mileage and a check engine light that come on periodically. With Shell high Octane premium I am getting much better pedal response, better gas mileage and no more check engine light. I guess all these gauges in newer vehicle are good for something

I wonder if the gunk buildup is what leads to blow-by that has killed high mileage engines in the past? It could be worth the extra $ at the pump if it keeps you from replacement or rebuilding the engine in the future.
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Old 03-02-2008, 03:58 PM   #13
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haven't noticed a difference, and definitely tested all three octane levels available. when prices were lower, it seemed a worthwhile hedge to buy the high just in case it helped, but given no real tangible difference and prices, i think the regular is fine
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Old 03-02-2008, 04:54 PM   #14
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sometimes

when I am climbing hills my wrangler will ping on regular,but normal on road it is fine so I put the good stuff in when I go offroad.
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Old 03-03-2008, 11:48 AM   #15
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Quote:
Originally Posted by jim1740 View Post
when I am climbing hills my wrangler will ping on regular,but normal on road it is fine so I put the good stuff in when I go offroad.
alternating between reg and premium is a dumb idea. Its like being drenched in ice water on a 90 degree day. Its a shock to the system.
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Old 03-03-2008, 11:52 AM   #16
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Originally Posted by fbtased2002 View Post
If it does improve your gas mileage is it enough to be worth the extra price?
it depends on the difference in price from reg to mid-grade to premium. Here in Jersey, the difference between reg and premium is about $0.20; at that much of a difference, its like paying $0.05 more for regular.

In my opinion, its well worth it.

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