What octane gas do you use? (The Mother thread) - Page 5 - Club Lexus Forums


What octane gas do you use? (The Mother thread)

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Old 05-08-06, 07:22 AM   #61
sha4000
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you can use regular and the computer will adjust performance for the lower octane fuel so you wont get as many MPG and power will be slightly reduced
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Old 05-08-06, 05:12 PM   #63
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Quote:
Originally Posted by 99LS400BLK
i was just wondering what type of gas all of you guys use? is it necessary to fill it with supreme? since gas prices are so high, i was wondering if woudl be harmful at all to put plus or regular in the car
I have had my '98 LS for just over 2 years. I have always run Plus(89) gas in it and I can't tell a difference from the couple of times I actually used Premium(91). I have actually used Regular(87) a time or two with no ill effects but was worried it might cause other problems over time (like carbon build-up and such.)

I also have not noticed any difference in MPG's. I get 20-22 in strictly city driving and I recently got 32 MPG on an Interstate trip where I didn't need the air on.

There seems to be a *widely* varying opinion on this topic.

Last edited by Hackman; 05-08-06 at 05:21 PM. Reason: Adding detail
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Old 09-21-06, 03:52 PM   #64
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Unhappy reg gas?? yes or no

is it ok if i put reg gas in my 90 ls the told me to and he said that is what he been doing but i dunno wanna put prem and then something happens cause it been on reg for so long please help
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Old 09-21-06, 04:09 PM   #65
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Mine was on regular gas before I got it for the last few months till I bought it...but it's DEFINITELY RECOMMENDED to use Premium, hence why it says "PREMIUM FUEL ONLY" in like 3 different places...so that's what I use now.

Sometimes it can cause a slight tick in the engine..but when you switch gas your engine computer eventually learns to handle it somewhat...I dunno, if the manual says use PREMIUM, I have faith in Toyota's recommendations...
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Old 09-21-06, 04:21 PM   #66
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Stick with premium boss
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Old 09-21-06, 04:24 PM   #67
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thank u guys so much!!!!
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Old 09-21-06, 05:25 PM   #68
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if they rape u for $$ for premium then run the middle mix (89-90) octane and you shouldnt have TOO much trouble.

if ur switching to a lower octane try this, right after u fill up the tank w/reg unplug the battery ground for about 10mins to reset the ECU, that way it will take less time to adjust the fuel maps to the lower octane.
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Old 09-21-06, 06:20 PM   #69
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Thanks for the more IN DEPTH break down for her, PD...You're always there for that!!
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Old 09-21-06, 06:44 PM   #70
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Quote:
Originally Posted by PureDrifter View Post
if they rape u for $$ for premium then run the middle mix (89-90) octane and you shouldnt have TOO much trouble.
.

lucky.


our premium up here is 90 octane at $3.10

im about ready to throw some Xylene in.
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Old 09-21-06, 06:52 PM   #71
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it's like 2.45 here in GA for 93 octane.
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Old 09-21-06, 07:10 PM   #72
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it was ~$3.20 for premium here in cali but that in like warehouse gas place and i havent filled up in about 2 weeks.
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Old 09-21-06, 11:15 PM   #73
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Premium here in Ontario, Canada is ~$1.00 / litre which is about $4.00 for a US gallon!!! Ouch
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Old 09-21-06, 11:19 PM   #74
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2.40 in Athens GA. I think the highest i paid was like 3.20 back in july. I remember yelling at the pump. It was like a 67 dollar fill up. I remeber to save gas i wouldn't run the AC. I wonder if it made a difference.

Ouch 4 bucks a gallon. That would be like an 84 dollar fillup. ew. Sorry dude.
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Old 09-22-06, 12:46 AM   #75
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You may also just unplug the fuses for the FI ECU. That way to still retain seat memory and radio memories.
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