Unleaded Gas question for 2.0L engine

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jspeer23

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Thanks for all the info...





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JHTS

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I didn’t say aftermarket tuners run the vehicle lean. The factory fuel curve is very rich and therefore safe. You can lean the factory curves out and gain hp but they dont lean the curve out so much to make the vehicle run lean.
 

DadJokes

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Everyone has different needs from a vehicle but me, personally, if I care about power and the engine is octane limited, I’ll opt for premium and usable power. Otherwise I’d of got something else that was cheaper and ran on 87.
 

Punkindave

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In all fairness the manual says for “optimal performance “ use 91 octane.

My question is who’s racing their JLUR? There are far better choices for going fast than a Jeep!

But anyway, your Jeep, your money.
Gregj
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This is an old manual.. FCA updated and my 2018 came with a note in the glove box stating that 87 is required but 91 for maximum performance.

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Gregj

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This is an old manual.. FCA updated and my 2018 came with a note in the glove box stating that 87 is required but 91 for maximum performance.

1592849613142.png
The change in the manual only states what I said in an earlier post, if your engine is knocking, use higher octane. They both say the engine is designed to operate and meet emissions standards and provide satisfactory economy and performance with regular gas.

Like I said “your Jeep, your money”. Mine “provides satisfactory economy and performance with regular gas”.

Gregj
 

AnnDee4444

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I didn’t say aftermarket tuners run the vehicle lean. The factory fuel curve is very rich and therefore safe. You can lean the factory curves out and gain hp but they dont lean the curve out so much to make the vehicle run lean.
Assuming that the aftermarket tuners are targeting maximum power, for the OEM tune to be richer it would also have higher hydrocarbons than the aftermarket tune. I highly doubt this is true.

In my experience NA aftermarket tunes gain most power from ignition & fuel timing manipulation, but are always still targeting the values shown in the chart above. If the engine is equipped with variable valve timing, even greater power gains can be found by fine tuning the crossover point (from the low camshaft to high camshaft). Continuously variable valve timing (such as the Alfa Romeo's GME 2.0) can have yet an even greater gain with aftermarket tunes. And then there is boost...
 

JHTS

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Assuming that the aftermarket tuners are targeting maximum power, for the OEM tune to be richer it would also have higher hydrocarbons than the aftermarket tune. I highly doubt this is true.

In my experience NA aftermarket tunes gain most power from ignition & fuel timing manipulation, but are always still targeting the values shown in the chart above. If the engine is equipped with variable valve timing, even greater power gains can be found by fine tuning the crossover point (from the low camshaft to high camshaft). Continuously variable valve timing (such as the Alfa Romeo's GME 2.0) can have yet an even greater gain with aftermarket tunes. And then there is boost...
The original question in the thread was can you run 87 gas in a 2T. I only mentioned tuners to illustrate there is a nice safe tune for the 87 octane and one of the things you can manipulate is the fuel and still be safe.
 

Punkindave

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The change in the manual only states what I said in an earlier post, if your engine is knocking, use higher octane. They both say the engine is designed to operate and meet emissions standards and provide satisfactory economy and performance with regular gas.

Like I said “your Jeep, your money”. Mine “provides satisfactory economy and performance with regular gas”.

Gregj
Agreed, just wanted to post the current manual page!
 

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During last winter I could not feel any difference however now that we have higher summer temps, the 91 makes a noticeable difference.
 

Mikefly562

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I did a 1220 mile trip from the Seattle area to SoCal, via Reno and the Eastern Sierra (With a stop at the Alabama Hills in Lone Pine for some off roading) and during the trip, I averaged 25.9 MPGs. Traffic was moderate, so my average speed was in the low to mid 60s. I used premium fuel the whole time (92 octane in Washington and Oregon, and 91 in CA). During a 30 day business trip last year, my Avis rental car was a Jeep Sahara with the 2.0L eTorque engine, and I used 91 octane for the entire rental period, and over 4500ish miles, I recall the gas mileage being about 26-27 (mainly desert driving level ground).

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