Anyone know of a real time fuel mileage computer for our rigs. Want to find the sweet spot for hiway mileage.

 

I think some people use the scangauge II if i'm not mistaken.

 

Does your truck have the overhead computer with temp and compass? If it does should be able to display mpg avg, real time mpg, dte, etc. I know mine does

 

Nope, it's not that easy.

 

Not sure if this is exactly what you want, I dont have one but came across it when I was looking for the same answer.
Hopefully somebody here has tested this or another like it with some feedback for both of us?
Bully Dog WatchDog Monitor $255 Direct from their website.
The WatchDog Gauge is the ultimate vehicle monitoring system for any vehicle 1996 and newer. The WatchDog monitors all standard vehicle PIDs and reads and erases diagnostic Trouble Codes. The WatchDog allows the user to set vehicle temperature warnings to notify the vehicle operator when a particular vehicle parameter reaches a set temperature. The WatchDog can calculate, record, and save a range of vehicle performance tests such as 0-60 mph times and 1/4 mile times among a few other available tests. The major feature of the WatchDog is the "Driving Coach," a patent pending feature that helps drivers improve fuel economy, edmunds.com points out that aggressive drivers can save as much as to 37% in fuel by adopting better driving habits.

 

The Dodge overheads are not accurate.

 

I just bought one of those a couple days ago. It monitors more than just fuel mileage and you can watch up to 4 parameters at a time. I have not yet figured it all out but did set it up today to watch mileage and a couple other things. I haven't driven it since I have that done. Appears to be pretty a cool setup.

 

True but helps give an idea for sweet spotting.

 

X2 Every time I've compared real mpg to this it's at least 2-3 off