Install a vacuum gauge for better mpg?

[kozaz]

I saw a qoute on the web and had no way of verifying it, or knowing why it would help mpg?

START QUOTE Install a vacuum gauge and try to maintain the highest vacuum reading possible when driving. END QUOTE

What would this do for me (I Have an older 86 fuel injected Toyota MR2)

[ZugyNA]

I put a multimeter on the O2 sensor to monitor cycling (closed loop) and also had a vac gauge hooked up. Found that with what I was testing that the engine was usually in closed loop when the vac reading was above 10 to 12 " hg. Some times needed to shift down a gear to maintain the 10-12" hg.

Either a vac gauge or an extra spring on the throttle setup to make the pedal stiffer when you push past the place where you hold it for cruise. Both remind you to lighten up.

[cfg83]

kozaz -

It's on my todo list to install. Try these threads :

Vacuum Guage and Digital Fuel Gauge - 02-05-2006
http://www.gassavers.org/showthread.php?t=477

What's my vacuum gauge telling me? - 05-08-2006
http://www.gassavers.org/showthread.php?t=878

Vacuum gauge instead of Scangauge? - 07-15-2007
http://www.gassavers.org/showthread.php?t=4356

For your 1986 MR2, a vacuum gauge would help. It also tells you things about your engine's health. I got the following from an el-cheapo Saturn manual on CD from ebay :

Attachment 1075
Attachment 1076

CarloSW2

[DarbyWalters]

Since vacumm occurs most when you are off the go pedal...keeping it in the "red zone" (vacumm) will mean that you are burning less fuel. It is kinda a guage of your throttle position...

[kozaz]

Looks like I just found my scanguage alternative.

Thanks Guys for the info!