Premium Gas

[churp]

No...it depends on how you drive. Lots of flat land and easy driving---87 octane. Lots of hills without slowing down and not creeping up them, and lots of fast starts----you may see a little better mileage with higher octane, but only during those higher load conditions. Each individual driver would have to judge for themselves if it would be a cost benefit....it's a slim one at best, but it may feel like a little more power in those conditions.

[WRBlue]

Originally Posted by churp

No...it depends on how you drive. Lots of flat land and easy driving---87 octane. Lots of hills without slowing down and not creeping up them, and lots of fast starts----you may see a little better mileage with higher octane, but only during those higher load conditions.

And only if your getting knock during thoes times. We drove up to Tahoe a couple months ago in the Yaris. It was slow, we did climb 8000 feet, but there was no knock and we got about 35MPG (higher than our average). Next time we're taking the WRX though ;)

[churp]

Originally Posted by WRBlue

And only if your getting knock during thoes times. We drove up to Tahoe a couple months ago in the Yaris. It was slow, we did climb 8000 feet, but there was no knock and we got about 35MPG (higher than our average). Next time we're taking the WRX though ;)

You will not get a knock unless the ECU malfunctions....but it is guaranteed a 10.5 to 1 compression engine without knock sensors and ECU runs like crap on 87 octane. You would be able to get it to run level ground and very mild acceleration with good mileage,but you wouldn't want to drive up a hill. If you retarded the timing enough to be able to climb a hill the gas mileage would suffer big time. The ECU w/ knock sensors are wonderful items!! Premium would only add a little more power/efficiency on the climb IMO...definitely not enough to match the WRX!