Low gas mileage, no codes

Tiny
DEVILLE MAN 93
  • MEMBER
  • 1993 CADILLAC DEVILLE
  • 4.9L
  • V8
  • 2WD
  • 150,000 MILES
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?
Tuesday, February 4th, 2020 AT 7:58 AM

1 Reply

Tiny
JOETECHPRO
  • 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
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Tuesday, February 4th, 2020 AT 12:23 PM

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