Is Premium fuel necessary for the avalon?

no not at all. its just like saying your bmw requires mobil 1 oil. plain old auto parts store oil will do the same thing, its just fucking oil. basically, what happens, is that toyota has signed a deal with probably shell or esso, saying that you need to use Premium. its just a scam.

Wow... I don't even know how to begin on this one... 1) BMW only recommends Mobile 1 but they actually have a requirement by warranty that excludes most conventional oils. Syn Blends and Synthetics tend to meet it. This is due to small oil passages on various engine components. 2) If they recommend hi-octane it generally means the car has fairly advanced timing and you can get various problems from using lower grade. Predetonation, Pinging, Incomplete detonation, engine run-on... Although not likely here in the states because the gasoline rating is generally higher than stated. Additionally the rating may be different. You'll notice many pumps state they are rated a certain way. (R+M)/2 or something like that. Anyway on many foreign cars the rating is done with a different system. Can't remember how it works but I know the 93 octane minimum on older Porsche actual equals 89 octane with the U.S. system. Not sure if that applies to your vehicle, but read the fine print. Likely your car will be fine with a lower grade, but if it asks for 91 don't get 83... only go one grade down at the most, and if the car hesitates or makes an odd sound, switch back. Keeping the car well tuned will decrease many problems associated with low octane gas. Since you're talking about a Toyota that requirement may be there because they don't expect you to keep up with your car.

i like this guy. he knows what he is talking about unlike most user on here i bash on. Gj giving correct advice!

No, but you get 272 HP on Prem, 268 HP on Reg, and you will get 3-4 better MPG on Prem, and for a lousy 20 cents a gallon you get 4 points more octaine over Reg.

while lower than recommended octane does call detonation, most modern engines sense that (knock sensors), some just retard some timing, some just do it enough to get it to stop, others back it way off limiting power decreasing power and MPG, as they don't want you to use lower octane.

Car engines are designed and "tuned" for the specified gas octane shown in their manual. It has nothing to do with timing and other things mentioned here. It has to do with compression. If your engine compression is lower than what higher octane requires, using higher octane will damage your engine. No one better than the manufacturer to tell what gas and what oil the car needs.

• Check owner's manual (or dealer if that is too complicated). • User whatever octane rating is specified. • The required octane rating is based on the engine's design. • Using lower octane rating can result in engine damage. • Using higher octane rating is just burning money for no good reason. • The "red light racing" crowd will crow about all the extra horsepower they get from premium. They don't really. They're idiots. Ignore them. • For the researchers: - https://lifehacker.com/what-happens-if-you-put-the-wrong-octane-of-gas-in-your-1785407622 - https://www.cartalk.com/blogs/dear-car-talk/what-do-when-you-need-octane-between - https://en.wikipedia.org/wiki/Gasoline - https://en.wikipedia.org/wiki/Octane_rating

Follow the car manual if it says premium run premium if regular put regular better for your car and your pocket

What is the best gas for the 2008 touring

GuruGBRBJ, read the owner's manual. The best way to make sure you're getting consistent month-to-month performance is to always buy gas from the same station; or if you travel a lot at least use the same brand. But _always_ use the octane rating specified in your owner's manual. If you pull in somewhere and they don't have that rating, find another station. I made the mistake of using a different octane (92 instead of 89) in my 5.7L Hemi on one trip out to the west and performance suffered; the documented mileage dropped from 19.5 mpg to 16.5 mpg until I ran through two tanks of 89. Octane rating determines how and when the fuel fires in the cylinder after the spark (see my earlier comment). Engine computers can compensate some but not completely.