culubalo

My car is under 25000kms on the odometer and has done mostly highway driving. For a while now some creaking and rattling noises in the cabin have started coming to my attention and I"m not sure if I"m being OCD about it or if it's too much creaking and rattling for the car. The vent on the front center air con creaks at the left side sometimes when I go over bumps and things, I've found I can also make it creek by pressing down on the bottom part of the vent exhaust. There is also a couple of rattling and creaking noises coming from the right door (or thereabouts towards the middle of the car between the driver and rear passenger seat) and a rattling noise from the left rear part of the car which I noticed today and a creaking noise coming from what sounds like the center rear. The sounds aren't always there and are only heard on bumps and the like such as when driving over a slight bump on the highway, sometimes they make sounds sometimes they don't. Is there something I can do? Like bring it up with Lexus or have it looked into myself?

My problem isn't with the power it's how much fuel it uses for what power it produces, Toyota has engines in much cheaper cars with higher displacement, considerably higher power output and which only use marginally more fuel.

I'm not trying to troll I'm sure there's a good reason for this and I'd like to know what it is. Lexus puts a 2.5 V6 into the IS250 and IS250C as well as the new GS250 (which looks to be the exact same engine but with 1kw more power). What I don't understand about the engine is it doesn't make much power or torque and needs to be rev'd like mad to actually get to what little power it makes and the engine uses quite a bit of fuel for the power and displacement, it's rated at 9.7l/100km. Meanwhile Toyotas 3.5 V6 which they put in the Aurion (let's not get into the IS350) produces substantially more power and Torque (200kw and 336nm in 3.5 vs. the 153kw and 252nm in 2.5) while using *only* 9.9l/100km. It's a larger displacement engine yet it barely uses more fuel and it produces a very high amount of power and it does all this without requiring the premium fuel the IS250 does. At first I thought the engine was just ageing (really like the IS250 which has been around for yonks) but since they put the exact same engine in a new car (the GS250 albeit very slightly revised) then Lexus MUST have a reason for it despite the lacking power and poor fuel economy, otherwise they would surely have wanted to put in a better engine or at least a 2.5 litre engine with better fuel economy. Is there any defense which can be made for the 2.5 v6 or is it just a weak point in an otherwise great car?