scangauges are awesome (ultragauge is the other one). either of these are great little devices.
I always try to point at the "201 tips to save gas" at the top of the screen. there are a lot of things that one can do. you have to decide what you are comfortable doing. some are as simple as adding air to your tires. others are more complicated.
welcome to the site and I hope you find it helpful. you are doing well with what you have already.
Be the change you wish to see in the world