I've been thinking about running 89 octane in my '98 5.4L Ex.
Pros & cons?
Pros & cons?
Feb 11, 2006 at 1:46 PM
1998 Ford Expedition 89 Octane
RJT1210
- MEMBER
- 4 POSTS
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Higher octane in my 98 f-150 5.4 has given me better gas mileage but only on highway trips, around town no diffence. If the engine runs withour pinging it is a waste of money IMO.
Feb 12, 2006 at 5:29 AM
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If the 5.4 runs without pinging, higher octane is a waste of money. It may improve highway mileage only and makes little difference around town.
Conversation Summary
The owner of a 1998 Ford Expedition 5.4 asked about the pros and cons of running 89 octane. An expert with a 1998 F-150 5.4 said higher octane improved highway mileage only, made no difference around town, and is a waste of money if the engine does not ping.