Awesome Product (2009-01-06)
This is a really great product. It does everything you want it to do. You just plug it in and start using it. Then you read the extremely clear instructions and learn how to fine tune it for your vehicle so it is spot on accurate. This is one of the best products I have bought in a long time.

Doesn't like cold weather (2009-01-06)
Bought his product in mid-December and hooked it up for a long winter vacation trip. Fast data rate does not work with my car (2001 Ford Crown Victoria), but Normal does, which updates about every two seconds.

Setup is easy and installation with velcro strips easy and pretty secure on my dashboard. However, its performance and reliability leaves a lot to be desired.

During our 6-day trip we had temperatures in the 5 - 15 F range and the Scangauge II was very unreliable until the car was warm inside. It would typically turn on when the car was started, but would report only one or two parameters out of four, and would turn off and on randomly. Only after about 10-20 minutes of driving, when the cabin was warm, did it work reliably. But then the measures were basically screwed up for the trip, in my opinion.

Also, after an initial fill-up, I filled up the car again when we were down to a quarter tank, like the manual suggests. I then had to adjust the measure up to +19% - i.e. the ScangaugeII reported figures that were almost 20% off. At the next fillup, it was even more off, and had me adjust up to +25% - which yielded completely unrealistic figures for the following 5-hour drive. Later, after another fill-up, I could adjust down again (you compare the amount of fuel the Scangauge thinks you used with what you actually used, which is evident when you fill up the tank) but of course, I don't have much faith in it anymore.

I will return it for a replacement and update this review, if I can, with my results.

Inaccurate, unreliable (2009-01-06)
The numbers this thing was showing for my 4 cylinder car were more like V8 numbers, and I did setup the system as a 4 cyl. After about 1 week, I noticed the unit started shutting off after a little bit into a trip. This makes it not very useful at all.

Scanguage II (2008-12-20)
Simple installation, provides more info than needed, but simple to set up to see what you want. Performs as advertised and makes me concious of how I can conserve fuel - even at the current $1.40 price... Simple to move from car to car. More contrast in the display would be the only improvement I would suggest.

Works as advertised. (2008-12-14)
This works just great.

I don't know why the auto manufacturers do not include this type of gauge with all cars they make.