The blower on a furnace does tend to be the single largest consumer of electricity in a home, that is why sealing and insulating not only save fuel but they save electricity.
Mine tends to add $10-15 per month as well in the heating season.
You can clean your duct work so there is less resistance, changing your filter more often and using a high quality filter is often worth the cost of the filter, you might also look in to a dual speed fan, not sure on retrofitting one, but if it can be done it might be worth it.
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