The Gas currently have 27 points from 25 games, but Penney insists they will only guarantee survival with another 27 points from the remaining 21 games of the season.
"You would like to think that 50 points would be enough, but with other teams beating each other you might need 53 or 54. We want to get there as soon as we can," Penney told the Evening Post.
"Of course, I'm not saying I want us to finish with 54 because I'd like to us to get to 60 if we can. But we have to take it in stages and get as many on the board as quickly as possible.
"It's all about what we do and we have to get past 50 points as quickly as possible. I'm not too bothered about what everyone else does. Since I've been here, I've been trying to emphasise our strengths rather than worrying about the opposition.
"Football is all about confidence and momentum. There was a feelgood factor from Saturday and it's important we carry that on. Hopefully, now we can get more clean sheets, more wins and start climbing the table."