Is it worth it to update from oil to gas heat?

[Jessica H.]

We have an older home we are going to rehab, it had a new oil furnace put in in 2006; however, with oil not being near as efficient as gas do you think it is worth the money to switch? This is a flip. I am unsure what potential homeowners might think if we just left the oil. Will it take a lot longer to sell? Anyone have experience with this?