91 octane gas for 2.4L
Member
Joined: 09-02-2006
Posts: 48
From: Palm Bay, Florida
Originally Posted by FlintHHR
How does the HHR run with using 89 octane? I mean, its inbetween the reg and premium, so wouldn't be a nice compromise?
Believe it or not i'm getting better milage from the 89 than I got from the 93..I'm only on the forth tank of gas and I drive 102 miles on 95 a day to work and back..I really don't know how it will do in the city.... I will stay with the 89..
Senior Member
Joined: 05-03-2006
Posts: 882
From: Newfoundland, Canada
I found this little write up on the Chevron site that I thought might enlighten a little on octane and fuel economy:
Don't Buy a Higher-octane Gasoline to Improve Fuel Economy
Octane and energy content are not related. Premium-grade gasoline doesn't necessarily have a higher energy content, especially if it is oxygenated.
The exception to the above advice is when a lower-octane gasoline doesn't satisfy the octane requirement of the vehicle's engine. The abnormal combustion that announces itself as knocking reduces engine efficiency. Using a higher-octane gasoline that eliminates knocking will improve both engine performance and fuel economy.
Many newer vehicles with an electronic control module (ECM) also have a knock-sensor device. When the sensor detects knocking, the ECM retards the engine's ignition timing to eliminate the knocking. This happens so quickly that the driver never hears the knocking. But retarding timing decreases power and fuel economy. A higher-octane gasoline may improve the performance of knock sensor-equipped vehicles that have less power than when new.
There is also an interesting read here:
http://www.co.suffolk.ny.us/webtemp3.cfm?dept=3&id=2049
Don't Buy a Higher-octane Gasoline to Improve Fuel Economy
Octane and energy content are not related. Premium-grade gasoline doesn't necessarily have a higher energy content, especially if it is oxygenated.
The exception to the above advice is when a lower-octane gasoline doesn't satisfy the octane requirement of the vehicle's engine. The abnormal combustion that announces itself as knocking reduces engine efficiency. Using a higher-octane gasoline that eliminates knocking will improve both engine performance and fuel economy.
Many newer vehicles with an electronic control module (ECM) also have a knock-sensor device. When the sensor detects knocking, the ECM retards the engine's ignition timing to eliminate the knocking. This happens so quickly that the driver never hears the knocking. But retarding timing decreases power and fuel economy. A higher-octane gasoline may improve the performance of knock sensor-equipped vehicles that have less power than when new.
There is also an interesting read here:
http://www.co.suffolk.ny.us/webtemp3.cfm?dept=3&id=2049
Platinum Member
Joined: 05-09-2006
Posts: 6,805
From: "Upland" Mesa, Arizona
Originally Posted by nfboy
I found this little write up on the Chevron site that I thought might enlighten a little on octane and fuel economy:
There is also an interesting read here:
http://www.co.suffolk.ny.us/webtemp3.cfm?dept=3&id=2049
There is also an interesting read here:
http://www.co.suffolk.ny.us/webtemp3.cfm?dept=3&id=2049
Off post topic....by by
Senior Member
Joined: 04-19-2006
Posts: 163
From: Westborough, Ma
Im using 89 octane...and my dic say I'm getting 25mpg (I've never reset my dic btw)....my driving is 50/50 highway/not the highway...my last 4 tanks my mpg ranges 23.5, 24.2, 24.6, 25.7 (my dic is nice for an over all avg but I also calculate my mpg with a tank by tank software program, btw the software over all avg is 23.9mpg)
ok you can all stop laughing now about my dic....
ok you can all stop laughing now about my dic....
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bigjacksauto
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Jul 25, 2012 10:40 AM