What do you think?

So my friend offered me a ride to work, I usually take the bus, but she insisted it was too hot to stand outside and wait 20 minutes for a bus and she’d rather take me to work. I take the bus because it’s cheaper than uber and I definitely saved a lot of money these past few months and will be able to get my own car soon. She says it’s kinda rude of me to not offer her some gas money?