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Old 08-15-2008, 09:42 AM   #3 (permalink)
Daox's Avatar
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,033

CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 56.69 mpg (US)
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You can most likely increase oil change intervals, but you still need to change filters every few thousand miles to ensure it stays filtered. I'd also highly recommend having and oil analysis done after each change to see if the engine is wearing or not. That will tell you pretty much everything. Based off the results you can set the next change.
Current project: Adding regenerative braking to the Mirage