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User_3336
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Too bad driving isn't all downhill, eh?3 miles of downhill
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Reading the owners manual, it says 89 gasoline is recommended as it using Top Tier gasoline. The only Top Tier gasoline available locally does not hav
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theblet
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ferraiolo1
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Only if you put the cai brand sticker on your back window.
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What if you put it on the windshield?
Fatherof3
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It can be . I remember walking to school 15 miles uphill both ways with snow up to my knees etc etc . lol
Mountain Whiskey
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That will be bad news and have the opposite effect.
jzinckgra
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I don't know how some of you guys are pulling 20+ mpg. Best I can do on my 50mi commute is 17.6 hand calculated and it's the same regardless if eco mode is on or off. That's about 60% highway and 40% back roads where I'm very light on the pedal. I've got 3.21 in the rear too.
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There's too many hills in my area for good gas mileage. Need long flat roads
Round trip to my old office.
bigdodge
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theblet
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Why stop there? Get 4.11’s and 37’s!should have got the 3.92
Peter land
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Yes! The manual says for the best fuel efficiency and performance, need to use 89.
SD Rebel
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I actually spoke with someone in the refinery industry, she stated that often times, most octane levels are actually slightly higher than advertised to prevent them for accidentally being too low, so they overshoot just in case.
Often, an 87 will be closer to 88 or 89. Also, depending on how well the blender pump is working, which mixes 91 & 87 to = 89, you could be getting something even higher or maybe lower than advertised.
Either way, modern engines are designed to adjust accordingly, even with bad 87, it should still retard the timing. Then there is a question of pinging/detonation, and what that really sounds like. Some people can hear it clear as day, some can't and some have no idea what it sounds like.
Either way, the manual states 87 is acceptable, that should be the end of the conversation. 89 if you want the best performance, but if you don't notice a drop in mpg to make up the difference, no reason not to use 87 if you prefer.
Often, an 87 will be closer to 88 or 89. Also, depending on how well the blender pump is working, which mixes 91 & 87 to = 89, you could be getting something even higher or maybe lower than advertised.
Either way, modern engines are designed to adjust accordingly, even with bad 87, it should still retard the timing. Then there is a question of pinging/detonation, and what that really sounds like. Some people can hear it clear as day, some can't and some have no idea what it sounds like.
Either way, the manual states 87 is acceptable, that should be the end of the conversation. 89 if you want the best performance, but if you don't notice a drop in mpg to make up the difference, no reason not to use 87 if you prefer.
834k3r
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Just got done with a personal test of 87 vs. 89. After running several tanks of 89 (during travel baseball season where we tow our travel trailer), I ran two tanks of 87.
About halfway through the first tank of 87, I started noticing the engine would have a significant delay when moving after a stop. I would push the gas pedal as I normally do, and the engine would struggle. I added more throttle and then the engine was fine. That throttle delay got worse through the two tanks of 87.
I filled up again with 89, and shortly after filling up, the throttle delay is gone.
I did not notice any MPG difference (but I wasn't calculating it).
Personally, I'm done going with 87 (the throttle lag was uncomfortable).
About halfway through the first tank of 87, I started noticing the engine would have a significant delay when moving after a stop. I would push the gas pedal as I normally do, and the engine would struggle. I added more throttle and then the engine was fine. That throttle delay got worse through the two tanks of 87.
I filled up again with 89, and shortly after filling up, the throttle delay is gone.
I did not notice any MPG difference (but I wasn't calculating it).
Personally, I'm done going with 87 (the throttle lag was uncomfortable).
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The throttle delay was probably caused because the PCM retarded the timing to prevent detonation. 87 oct would be a last resort, I need gas and nothing else is available, for me.
SD Rebel
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I think the differences in how the engines react to 87 is the quality of that 87 being used.
Just as long as it's Top Tier rated from a good station, it should be fine.
Just as long as it's Top Tier rated from a good station, it should be fine.
Idahoktm
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Yep. My truck runs the same on 87, which is what I'm using right now.
