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Old 08-07-2009, 01:55 PM   #1
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High octane increase MPG on VX?

I do always use 87 octane gasoline in my VX. But 2 time I use 91 octane and my MPG was better. But colt stard is not 1/4 turn. I have to hold for almost 1 second before it start.

I just put 94 octane to se if it will be better MPG.

Also, if I change my stock coil for Neuspeed Sport 1.3/4" drop, it will help on MPG?

92 Mitsubishi Galant VR-4 4G63 A/T AWDTturbo 12.122@112.9 mph 0-60MPH:3.6s 50-75MPH:2.4s ,2x 92 Honda Civic VX (4.7l/100km)
Gone in 12 seconds GO FAST WITH CLASS, DON'T USE NOS!
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Old 08-26-2009, 06:00 AM   #2
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higher octane gas is harder to ignite hence the longer cold-startup time. the economy gain probably is from increased ignition advance since it isn't getting any knocking with higher octane (knock sensor input to ecu). with a high-mileage engine this is common because of carbon deposits taking up combustion chamber space (higher compression ratio) or glowing (or both)
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