Troubleshooting bad Gas Mileage?

I bought a 2019 in November with 19k KMs (~12k miles). I’ve put 1000kms on it and I’ve never gotten better than 7L/100km (33mpg). Any ideas what could be causing this bad gas mileage??

I certainly enjoy revving it out and sometimes hangout in a lower gear than I should because I like the sound, but this still seems like an issue somewhere else on the bike? Tire pressure is good. Any other ideas appreciated thx!