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Topic Review (Newest First)
04-25-2012 07:49 PM
pkmcd99 It depends how much money ya want to waste. Jeep says we only need 87 octane, so thats all my heep drinks.
04-25-2012 07:27 PM
Shawn75 Premium vs regular gas was on the pro side for the Wrangler in the pro vs con for my existing FJ or prospective new Wrangler. The FJ from 2007 to 2009 required premium. When Toyota tweaked the 1GR-FE in 2010 it changed, but up until then the FJ required premium. The manual FJ being full time 4WD had a MPG of 16.5. That was in San Antonio, after I changed the plugs. Because of the gearing, the 75+ mph that is common freeway speeds in metro Detroit was a killer on MPG; of course where speeds are MUCH slower in San Antonio it wasn't an issue. It is not uncommon to find drivers in the passing lane on the interstate in San Antonio driving 15 mph under the posted 60 or 65. Driving that slow in Detroit will get you shot. With the FJ in 6th gear, 2000 rpm will get you 60 mph. That 2000 rpm is on an engine that redlines at ~5500 and peak torque at 3600. In the Wrangler in 6th gear, 2000 rpm will get you near 75 mph, and that is on an engine whose redline and peak torque is about 1000 rpm higher than the Toyota. So my MPG is enormously better with the Wrangler AND on regular not premium. Fella, be happy you don't have to put premium in that filly and ride her until the sun sets. Yeee ha.
04-25-2012 04:38 PM
Disraeli
Quote:
Originally Posted by ThingsAbove View Post
The energy difference would result in about 0.5mpg less with E10 in a Jeep so it would be hard to notice but it adds up.

If you spend $3,000 year on fuel you'd be spending $100 more a year due to lost mileage from E10.
My expenditure will likely be closer to $750 for the year. Last year, I drove less than 2,000 miles.
04-25-2012 04:21 PM
ThingsAbove
Quote:
Originally Posted by Disraeli View Post
Ethanol-free gas stations in the U.S. and Canada

I'm running non-ethanol now but probably not for long, as the nearest station is 12 miles from my house and as I mentioned previously, notice no appreciable difference.
The energy difference would result in about 0.5mpg less with E10 in a Jeep so it would be hard to notice but it adds up.

If you spend $3,000 year on fuel you'd be spending $100 more a year due to lost mileage from E10.
04-25-2012 04:06 PM
Disraeli
Quote:
Originally Posted by DustinLH00 View Post
Thanks! Holy crap, the closest station to me is like 60 miles away. Seems like this is more common in smaller towns? I live in the 2nd largest city in the state...
Absolutely the case.

California only has five stations in the entire state.

You can almost feel the scam.
04-25-2012 04:01 PM
DustinLH00
Quote:
Originally Posted by Disraeli View Post
Ethanol-free gas stations in the U.S. and Canada

I'm running non-ethanol now but probably not for long, as the nearest station is 12 miles from my house and as I mentioned previously, notice no appreciable difference.
Thanks! Holy crap, the closest station to me is like 60 miles away. Seems like this is more common in smaller towns? I live in the 2nd largest city in the state...
04-25-2012 03:55 PM
Disraeli
Quote:
Originally Posted by DustinLH00 View Post
I have never seen a gas station that has gas with no ethanol. Every gas station I go to has a sticker at the pump that says "Up to 10% Ethanol Added". Am I missing something?
Ethanol-free gas stations in the U.S. and Canada

I'm running non-ethanol now but probably not for long, as the nearest station is 12 miles from my house and as I mentioned previously, notice no appreciable difference.
04-25-2012 03:50 PM
DustinLH00
Quote:
Originally Posted by ThingsAbove View Post
There is about a 5-7 cent a gallon difference in NC for E10 gas. When you say 25 cent difference is that E10, E15? I don't think our engines are rated for use of more than 10% ethanol blends/

Ethanol has 34% less energy than gasoline. So any ethanol blend will result in worse fuel economy in proportion to the amount of ethanol in the fuel. In the case of E10 that would be up to 3.4% worse mileage. Whether or not that works out economically in your favor depends upon the savings over lost mileage.

In NC when fuel is $3.85 (without ethanol) vs $3.80 (E10) then I'm only saving 1.2% while getting 3.4% worse mileage so economically it makes sense to avoid E10.

There are other potential long term drawbacks to using ethanol in your vehicle but Jeepers aren't the most gentle users of vehicles so YMMV.

I vote no to ethanol and avoid fuel stations that indicate its use.
I have never seen a gas station that has gas with no ethanol. Every gas station I go to has a sticker at the pump that says "Up to 10% Ethanol Added". Am I missing something?
04-25-2012 03:22 PM
ThingsAbove
Quote:
Originally Posted by lee indy View Post
im currently running a tank of ethanol free. its not making any difference that i can see. not 25 cent a gallong difference anyway.
There is about a 5-7 cent a gallon difference in NC for E10 gas. When you say 25 cent difference is that E10, E15? I don't think our engines are rated for use of more than 10% ethanol blends/

Ethanol has 34% less energy than gasoline. So any ethanol blend will result in worse fuel economy in proportion to the amount of ethanol in the fuel. In the case of E10 that would be up to 3.4% worse mileage. Whether or not that works out economically in your favor depends upon the savings over lost mileage.

In NC when fuel is $3.85 (without ethanol) vs $3.80 (E10) then I'm only saving 1.2% while getting 3.4% worse mileage so economically it makes sense to avoid E10.

There are other potential long term drawbacks to using ethanol in your vehicle but Jeepers aren't the most gentle users of vehicles so YMMV.

I vote no to ethanol and avoid fuel stations that indicate its use.
04-25-2012 12:19 PM
lee indy im currently running a tank of ethanol free. its not making any difference that i can see. not 25 cent a gallong difference anyway.
04-25-2012 12:13 PM
Mr. Sinister
Quote:
Originally Posted by Jurhip View Post
I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
If I were not getting 18/24 for fuel mileage, I might think something was wrong. I also don't seem to have this huge lack of power so many 3.8 owners complain of, mine gets down the road (and up the hills) just fine.
04-21-2012 03:34 AM
flyinion When I had my 350Z, one of the guys on the monthly group drives we did in the summer time told me Shell was supposed to be the best. Apparently he and his brother who both had 370's send their oil off to some lab every time they change it and it always gets changed with some kind of "special" oil and one of the tips that they got from their lab guy is that Shell is the best to use. Obviously I can't really say how accurate that is, but I DO get better mpg off of it and the butt dyno likes it as well, but of course the butt dyno is subjective.

Octane ratings, always go with the mfr. recommended unless you're running some kind of special tuning, turbos, supercharged, etc. If you really are having problems on 87 in a non-modified Jeep, something is wrong. Either bad gas, or a mechanical issue.
04-21-2012 12:56 AM
DustinLH00
Quote:
Originally Posted by aelwero View Post
normally I would agree, but I have heard the difference on my 2010 first hand It doesn't sound like pre ignition knock though, it actually sounds like valve chatter, which also shouldn't be affected by octane at all, but running higher octane quiets it nonetheless. An oil change will also quiet it down for a few hundred miles.

I haven't tried different gas stations though... might have to shop around and see who has better gas.
I am curious about brand as well. Near me BP, Shell, and Mobil are all very common and readily available. I generally only go to one of the 3.
04-20-2012 11:19 PM
aelwero
Quote:
Originally Posted by Jurhip View Post
I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
normally I would agree, but I have heard the difference on my 2010 first hand It doesn't sound like pre ignition knock though, it actually sounds like valve chatter, which also shouldn't be affected by octane at all, but running higher octane quiets it nonetheless. An oil change will also quiet it down for a few hundred miles.

I haven't tried different gas stations though... might have to shop around and see who has better gas.
04-20-2012 09:16 PM
kjeeper10
Quote:
Originally Posted by OH9JK

My Jeep likes Shell gas too


Both Valero and Sunoco the jeep pings. Shell she is quiet
04-20-2012 08:30 PM
Jurhip I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
04-20-2012 07:31 PM
Disraeli I'm still on my first tank but that tank is 92 octane non-ethanol.

So far, the computer is telling me that I'm averaging 14.2 mpg.

Do I care? Not really, but I'm going to do it for a couple more tanks as an experiment.

Then I'll probably switch to 87 and never look back.
04-20-2012 07:26 PM
XJ Knight All you guys talking about shell.. I haven't seen a shell gas station in 4 years

As to gas for your Jeep.. If your using anything other then 87 your wasting your money but the gas companies thank you
04-20-2012 07:23 PM
Casotakar1229 87 is same.
04-20-2012 07:20 PM
Mr. Sinister It's funny, I use Shell exclusively. Still pings on 87 and 89.
04-19-2012 07:41 PM
OH9JK
Quote:
Originally Posted by kjeeper10 View Post
We discussed this before. After installing the 35's and setting my tune to stock, the jeep would ping pretty good accelerating. Especially @ lower Rpms.
Doesn't do it tuned if I'm easy on the gas.
Also if I don't use Shell gas. If I'm near empty and fill up somewhere else I hear some light knock/ping under load.
With Shell gas she's quiet..... Strange
My Jeep likes Shell gas too
04-19-2012 04:29 PM
adg44 Rather than trying to use mid-grade (89) or premium (91/93), you should be focused on using a top-tier gasoline like Shell and putting in the recommended regular 87 octane. Top Tier Gasoline

- Anthony
04-19-2012 03:31 PM
rics1997 Running 89 octane wouldn't be too bad. There probably is a slight difference but doubt the cost will out way it but I guess it could very slightly. Other then that, without a tuner higher octanes are not tuned for your Jeep. Tuners like Superchips can tune the engine for higher octane but without a tuner it just isn't worth it.
04-19-2012 03:24 PM
CiDZillA I've got a shop that sells Regular and super (87 and 89) for the same price. I end up using the 89 but I've never seen or felt any difference when using other grades.
04-19-2012 02:09 PM
firehawk
Fuel

HI, use 87 reg. in my 2012, also used the same in my 07..
04-19-2012 01:59 PM
kjeeper10
Quote:
Originally Posted by Mr. Sinister
My 2010 pings under load on 87 and 89, so I run 93. No ping.
Average mileage is 18mpg back and forth to work, 24-25 pure highway driving, calculated by hand.
Bone stock auto drivetrain, wheels, and tires. Just a spacer lift.

Just the facts.
We discussed this before. After installing the 35's and setting my tune to stock, the jeep would ping pretty good accelerating. Especially @ lower Rpms.
Doesn't do it tuned if I'm easy on the gas.
Also if I don't use Shell gas. If I'm near empty and fill up somewhere else I hear some light knock/ping under load.
With Shell gas she's quiet..... Strange
04-19-2012 01:01 PM
Mr. Sinister My 2010 pings under load on 87 and 89, so I run 93. No ping.
Average mileage is 18mpg back and forth to work, 24-25 pure highway driving, calculated by hand.
Bone stock auto drivetrain, wheels, and tires. Just a spacer lift.

Just the facts.
04-19-2012 12:41 PM
TrueNorth I use 87 and "economy" modefor DD, the Unichip I have installed is tuned for 91 octane on "sport" mode so I'll fill up with 91 for wheeling trips and let her rip.
04-19-2012 11:02 AM
kik
Quote:
Originally Posted by snikt View Post
Been using regular (85) with no issues
Altitude. 87 for the rest of us at sea level.
04-19-2012 10:52 AM
snikt Been using regular (85) with no issues
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