Calculate op amp gain

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8Volts:
As for the specs, they says

Common-Mode. DC,VCM =0VtoV+ −1.5V,

so I guess this means :

Vcm = V1 + V2/2. where Vcm MAX is (V1) -1.5vdc

The above looks like a common mode input voltage range (there are various acronyms for this) ... that is that any common mode voltage must be in that range or the op-amp won't work as expected. You might want to read this long thread on that :

https://forum.sparkfun.com/viewtopic.ph … p&start=15

Op-amps will also have a Acm spec, different from the above, but it’s usually expressed as a common mode rejection ratio:

http://en.wikipedia.org/wiki/Common-mod … tion_ratio