What Octane?

[VX KAT]

93 (or 92 at some stations) octane - 300 miles to a tank - ive never driven to where the gas light has come on but ive noticed that when my gas gauge reads half a tank i can only put about 9 gallons in it until it is completely full -so im thinking if i have a 22 gallon tank when im on empty i could actually still have a few gallons left in there - and with the difference between an entire tank of 89 vs 93 being less than $5.00 id rather just run the cleaner stuff just to be safe

--funny (sad) how in 04 people in this thread were complaining about $1.84 a gallon

My tank runs that way also....apparently more gallons fit in the first half of the tank ()....
oh, and it's capacity is 22.5 gallons....cuz ya know that extra half gallon can getcha a few more miles


I've gone as low as the needle can go, (but no light) and total fill was only 18.80 gallons. and 297 total miles.....
I've never hit a 300+ miles tank yet....cuz I think it's really close to empty and don't want to run out....but it appears I've got about 50+ miles left (3.7 gallons @ 15 MPG).

But living out in the boonies, and often driving off road in the boonies...that hidden 3 gallons is a great safety cushion.


OCTANE- several past discussions about Octane vs. MPG.
Some say higher octane gets higher MPG.
Someone ran a real detailed experiment on this. Can't recall who...(maybe HiredGoon??)
Think they found higher Octane (Premium) DID increase MPG a bit.

I tried it...3-4 months Premium vs. many months regular....not much difference in MPG that I could see.

[89Vette]

OCTANE- several past discussions about Octane vs. MPG. Some say higher octane gets higher MPG.

Even within this thread, you'll find others who said the opposite...that lower octane produces best power by not inhibiting the "burn". Unless someone has run scans and sees evidence of timing retard, I gotta think 87 is best -- like the owner's manual states.

They wouldn't have coded timing tables for 93 octane and said use 87. Every few months you see how people are wasting their money buying "high-test" thinking it's better for their car. If it doesn't require it, it's not better.

btw...my guage hangs on full until 40-50miles, then it drops like a rock to 1/4 tank. So, it takes 50m to get down to full...and 25 miles to drop the next 1/4 tank. Pretty nice calibration their Isuzu techs!

Yeah...I finally broke my personal best and hit 16.5mpg last week. I finally got a few miles/day on the hwy. But, it's not the best cause it's during the to/from rush hour.