Scan gauge e

[Corsa]

After taking delivery of my 2011 ti patrol I am looking to get some sort of trip computer going so as I can get the best economy from my car.
Initially I was going to buy a scanguage ii but have since seen the scanguage e which is a little more compact.
My questions are has anybody used one of these?
What is the major differences between the two scan gauges and do you use the differences if there is?
Car is std as far as the driveline goes but may look at a chip and exhaust down the track but have heard an egt gauge is more important then ?

Any guidance will be appreciated



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