View Poll Results: Which octane you use?
87
1
4.17%
89
3
12.50%
91 (Cali)
6
25.00%
93
14
58.33%
Voters: 24. You may not vote on this poll
Octane comparison: 89 vs 93
#1
Octane comparison: 89 vs 93
I finally got my numbers from real world driving comparing 89 vs 93 octane.
93 = 20mpg
89 = 24mpg
Maybe I need to do some more road tests to get a better average but I'm just surprised at the difference. Which do you put in your Max? Any problem with sticking to 89 even though the sticker inside my gas door says to use Premium fuel for "Maximum Performance?"
93 = 20mpg
89 = 24mpg
Maybe I need to do some more road tests to get a better average but I'm just surprised at the difference. Which do you put in your Max? Any problem with sticking to 89 even though the sticker inside my gas door says to use Premium fuel for "Maximum Performance?"
#5
You'd need to track mileage for about a month on each octane level and average several tanks to get a better picture. Please don't tell me this was just a tank each. Yeah, way too much noise and variability.
#8
BTW I averaged 29.5 mpg on 93 octane on a road trip of about 800 miles once. I hit 31 in one direction and 28 on the way back. Stock 99 5spd, one passenger, some junk in tha trunk too. Unfortunately I didn't make the same trip on 87 to compare. Oh and tires were cranked up to 36 psi also.
#9
A friend an I just made a trip in his 89se 5spd, avg. speed of about 85mph, a few bumps upto 105-115. Plus a few runs down the drag strip 529miles on the odo with 1/8tank left on the tank when we pulled up to the gas station. 87 octane. Full interior + tools and crap. Plus him and me in the front. Not sure of the tire pressure. Only mods are CAI and no muffler.
#11
im a third gen owner and i can only run 93. even before i got the ecu (and other mods) if i ran under 93 i lose mpg. not a huge difference but the car ran like crap. the most i ever got out of my car was approx 36 mpg (all highway miles) but now i avg 20 and with the system more like 15 hehe. with a 5000 WATT RMS amp and a 120lb battery my alternator makes me eat soooooooo much more gas lol.
#12
Originally Posted by MrGone
A friend an I just made a trip in his 89se 5spd, avg. speed of about 85mph, a few bumps upto 105-115. Plus a few runs down the drag strip 529miles on the odo with 1/8tank left on the tank when we pulled up to the gas station. 87 octane. Full interior + tools and crap. Plus him and me in the front. Not sure of the tire pressure. Only mods are CAI and no muffler.
#13
87 octane is actually easier to ignite, as the higher octance (93) resists combustion due to the cylinder pressures better. In my old VG30 89 gxe I got better mileage with 87 octane than with 93, but the lower compression and less efficient coil/dist/wires ignition were surely the reason behind that. It was not up to the same ignition duty as the newer 10:1 and coil/plug of the VQ. My 98 I30t with a full exhaust runs very weak on 87 and although the gas mileage difference is negligible between 87 and 93 the extra $3 per tank is well worth it in available power and pep.
#14
Originally Posted by AllGo
87 octane is actually easier to ignite, as the higher octance (93) resists combustion due to the cylinder pressures better. In my old VG30 89 gxe I got better mileage with 87 octane than with 93, but the lower compression and less efficient coil/dist/wires ignition were surely the reason behind that. It was not up to the same ignition duty as the newer 10:1 and coil/plug of the VQ. My 98 I30t with a full exhaust runs very weak on 87 and although the gas mileage difference is negligible between 87 and 93 the extra $3 per tank is well worth it in available power and pep.
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