Does $25-30 a month for a gas bill in the city of LA seem like too much?

Someone told me that this seems high. We split bills and my roommate pays gas. The bills are for $24 -30 on a normal month to a whopping $80 when we used heat. We have an old heater with only one setting—high—which I think accounts for that. I’m moving out soon so I don’t care about the future, but I’m wondering if I should talk to the gas company to see if we’ve been hooked up to someone else’s unit, or if this is comparable to what others are paying…

Any advice would help.