Low gas mileage, no codes

1993 CADILLAC DEVILLE
150,000 MILES • 4.9L • V8 • 2WD
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DEVILLE MAN 93
  • MEMBER
  • 13 POSTS
My car had a single code which was a E30, however, I deleted the code and drove around for a day and didn't return. However, I still get low gas mileage. Does anybody have any ideas?
Feb 3, 2020 at 11:58 PM
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JOETECHPRO
  • ✓Experienced Mechanic
  • 705 POSTS
Hey DEVILLE MAN 93,

One of the easiest to correct and most common causes of bad gas mileage is low tire pressure.

A great place to start is to check and correct the tire pressures.

Also common service related items such as engine air filter, spark plugs and ignition system wear items if overdue will cause bad gas mileage.

Making sure all the service items are up to date is very important in the efficient running of your motor.

Hope that helps, if you have further questions please don't hesitate to ask.

Once you have ruled out these things we can proceed with further testing.

Regards, Joe
Feb 4, 2020 at 4:23 AM
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