EA's on gas.
A large car thats cheap to run... you cant beat it!
Pretty much check everything like a normal car...
Try it on gas and fuel, on an EA with a good gas setup there should not be much performance difference.
Check the expiry date of the tank, these need to be inspected every 10years which can cost upto $400 which may need to be taken into account in the purchase price. If it was installed more than 10 years ago and hasnt been inspected then the car is unroadworthy and hence insurance companies may refuse to pay out claims on it.
Check the airfilter box, if the car has back fired or been running in poor condition it may be cracked down the side (or in pieces). (Best tip here --- replace the clips with a ocky strap... that way if it does backfire you dont blow the shit outta your airfilterbox.)
Try a standing start 0-60. Simply floor it from a standing start (Steep steep hillstarts are even better) It if backfires or splutters it could have ignition problems (dizzy, leads etc, more $$$)
On a gas basis, the EA's have a hell of a lot fewer problems then the VN's. So hopefully she's ok and youll get years of cheap gas motoring.