Hi all bit of a newbie when it comes to my subaru its a classic 1993 wrx import if someone can help me shed some light on a situation i think might be developing with my car.

In the last 3 days i seem to have used absolute load of fuel?? Like 165 miles to 3/4 of a tank? That seems bit excesive i kno there heavy on fuel but thats abit much anyone elses like this?? Or should i investigate bit further? Just before anyone ask i havent been driving it like a helmet been taking it quite easy as im just getting used to i. Could it need a service or lambda problem? Has been sat for over 8 months doing nothing.