Does the new Tiida with 92 fuel need to choose a specific gas station? I feel like the state-owned stations' fuel lasts longer than private ones. Is it just psychological? How do you guys fill up?

Do I need to fill the P1 with 92 or 95 octane fuel?

I recently got an 08 Mazda 2 hatchback, 1.3L automatic. It has been driven 130,000 km over 15 years. I've been driving it for about 10 days, mostly commuting in the city with a round trip of 40 km a day, but the fuel consumption is ridiculously high... After the fuel warning light first came on, I added fuel worth 200 yuan, which was 25.6 liters, and drove a total of 247 km. The average fuel consumption was 10.35 liters/km, costing 0.8 yuan/km. After the fuel warning light, the engine light turned yellow as well, what's going on??? I didn't think too much and just drove to the gas station, asked the staff to fill it up, but it could only take 34 liters before the pump stopped. The staff said it was full. Isn't the Mazda 2's fuel tank capacity supposed to be 43 liters? Why is it full so much earlier, is there something wrong? Looking for help, how should I deal with this? Has anyone experienced the same situation?

What could cause the MG ZS to idle roughly? The shaking is more severe with private fuel, while it's milder with state-owned fuel?

The 2022 Haval H9 is approaching 40,000 kilometers, and I'm not sure how much longer the original spark plugs will last. Fellow car enthusiasts, at how many kilometers did you change your spark plugs? What condition were the spark plugs when you replaced them? Thanks! ***** Also, I've clearly stated it's the Haval H9 and posted this in the Haval H9 section. Please make sure it stays within the Haval H9 circle and not other H9 circles. It's really tiring, you're quite something! *****

My Jietu X70 has run 30,000 km, and when I cold start it, the idle is unstable, and the car shakes. After about ten seconds, it gets back to normal. There's no error displayed. I left it at the 4S shop for a week, and they cleaned the throttle, carbon buildup, and fuel injectors, but it didn't help. The 4S guys said it might be the fuel, so I switched gas stations, but there's still no change. Has anyone else experienced this? How did you solve it? Please let me know. 🙏