mpg on 93 vs 89 octane gas
05-30-12, 02:03 PM
#46
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@ zig@tr
I'm driving a 2007 AWD 2is and in mostly stop and go and a little bit of HWY I get 25-26mpg consistently, which I consider it good. I use 91/ Premium.
ok, I'm driving like an old lady and use the ECT snow mode when in stop and go.
When in PWR mode with a heavy foot it's a different story though...
I'm driving a 2007 AWD 2is and in mostly stop and go and a little bit of HWY I get 25-26mpg consistently, which I consider it good. I use 91/ Premium.
ok, I'm driving like an old lady and use the ECT snow mode when in stop and go.
When in PWR mode with a heavy foot it's a different story though...
05-30-12, 02:08 PM
#48
Lexus Test Driver
yeah I'm getting 22 city in my rwd 350. At a constant speed of 50mph my display puts my instant mpg right around 40mpg, all with 93 octane as previously stated
05-31-12, 01:43 AM
#49
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the octane level is just a figure of what threshold the engine can sustain at a certain timing map, the higher the octane level , the less chances of pre ignition , when the system sense mild knock it will retard the timing to compensate for the lower octane level, but by doing this you will mathematically lose power not at a low load, but in a higher load on the engine , but the engine management only has a certain parameters is can sustain before it throws a code , you might be able to get away with the 1 step down on fuel grade on a colder night , since it will give you denser intake charge which will keep you from retarding the timing.. it all has to deal with heat and pre-ignition .. mind you compression ratio is also heat when it compresses the air in the combustion chamber .. so to answer some of the people that do feel less power its not a placebo
06-02-12, 04:13 PM
#51
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Agreed. However, there are situations where the extra $3.00 doesn't pay itself off. If you don't get the car over 3k rpm's and accelerate gently, you won't have to worry about knocks. The extra octane will do nothing for you other than cost an extra $3 a fill-up. Of course, if you're like most IS drivers and you even occasionally push the car, you'll likely lose more MPG's than the dollar's you'd save by using a lower octane.
06-02-12, 08:41 PM
#52
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Agreed. However, there are situations where the extra $3.00 doesn't pay itself off. If you don't get the car over 3k rpm's and accelerate gently, you won't have to worry about knocks. The extra octane will do nothing for you other than cost an extra $3 a fill-up. Of course, if you're like most IS drivers and you even occasionally push the car, you'll likely lose more MPG's than the dollar's you'd save by using a lower octane.
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