89 octane on Base

[48-remi]

Recommended octane rating is 87. I have been running my Vibe on 89 octane since new because the compression ratio is 10 to 1. My first trip returned 37 mpg/imp gal or 31 mpg/us gal. Speed varied from 100 to 120 km/h - 60 to 75 mph - on a mix of highway and country roads, lots of wind and rain.Anybody else using mid-grade gas? Better mpg or am I just wasting my money?Rémi

[Shadow-Vibe]

Ever since I've had my car I have only been running 89, but my better half is running 87. Not really and differance, mine has been running low mpg but I just need to change my cone filter on my intake. I will wait until the snow is all gone though.

[zionzr2]

Quote, originally posted by 48-remi »Recommended octane rating is 87. I have been running my Vibe on 89 octane since new because the compression ratio is 10 to 1. My first trip returned 37 mpg/imp gal or 31 mpg/us gal. Speed varied from 100 to 120 km/h - 60 to 75 mph - on a mix of highway and country roads, lots of wind and rain.Anybody else using mid-grade gas? Better mpg or am I just wasting my money?RémiThe SEARCH feature yielded:http://forums.genvibe.com/zerothread?id=5483and http://forums.genvibe.com/zerothread?id=177and http://forums.genvibe.com/zerothread?id=13004

[48-remi]

Thanks for the info. I will switch to regular. It should be OK for my style of driving!Rémi

[northvibe]

:S with my style i need like 107 rocket fuel so i can go SUPER fast.....or not....you knwo whatever is cheapest

[micbarric]

From my '05 owners manual:"If your vehicle has the 1.8L L4 (VIN Code 8) engine, use regular unleaded gasoline with a posted octane of 87 or higher."It then warns about using gas below 87 octane. It seems that 87 is a "threshold" or absolute minimum for the base Vibe as well as most other vehicles on the road.I'm sure for most of us, and for average driving conditions, 87 octane will be fine. But for those in hot, dry locations, or those who drive their cars pretty hard, a higher octane may be beneficial.

[drunkenmaxx]

it doesn't matter if you run the hell out of it or baby it like a grandma, there is no benefit from using anything higher than 87 octane on the base. it's been discussed here way too thuroughly.of course, there will be those that claim, "i don't care what you say, i noticed a difference when i used premium. i got better mileage and it seemed a bit peppier" believe what you want, but for a cheaper price, my engine will run just as good with 87 octane as any other non-gt with the most expensive gas money can buy.