View Single Post
Old 06-30-2008, 01:11 AM   #6 (permalink)
EcoModding Lurker
Join Date: Jun 2008
Location: AZ
Posts: 11
Thanks: 0
Thanked 1 Time in 1 Post

If you're getting 10 inches of mercury, either your engine is sick, or it's a bad vacuum source. Should be getting 15-18 at idle.

Is the needle steady? Does it bounce up and down, or slowly fluctuate? This gauge is a great indicator of both engine health and economy. Check a service manual or on-line reference for details about the readings.

The boost side is a waste of money, unless you have a turbocharger. Not a popular ecomod option...

I've run that gauge for 20 years and it's about the best fuel efficiency meter there is (for ICE).
  Reply With Quote