I would not do it, but I have had a number of drivers that said they use regular fuel even though their vehicles specified (required or recommended) premium. I had a 430 and now have a 460 and always used premium and always tried to use top tier fuel. Even heard of LS owners who used regular. What are the long term consequences of using regular instead of premium? I know differences in power etc, but what else's?
I have a buddy with a new Acura MDX who has plenty of money, but will only use regular. Said he read in a AAA publication that regular was OK to use in any vehicle.
Any thoughts or information about this would be appreciated.

any long term consequences to using regular fuel not premium in ls460

thanks. I would never do it, like mechanical things and this car too much

I stopped using premium fuel at some point in my LS460 ownership, what I discovered was under a load (going up big hills, heavy acceleration) I would get some hesitation. That was about it - which was fine with me because I drove a ton of mikes every week - and I probably was saving maybe $500-$600 bucks a year. Not huge, but after a few years I probably saved $1,500 or so.

I traded my car in at 178,000 miles. At that point it began "using oil". I was going through a quart every 1,000 miles. Was it because I damaged the engine because of the fuel? I'm not sure. I tend to think no because of the way I drove and the type of commuting I did. My drive was flat highway, 80 miles round trip everyday. Easy. But maybe it was because of that...maybe the rings were **** because if engine knock and the pistons rattling off the cylinder walls? I never experienced any sort of engine knock that I could hear (and I know what it sounds like). And the knock sensors in these cars act very quickly to quickly retard timing. But who knows?

I will say that there are many people who have experienced oil consumption at high mileage with the 460 (and many other cars right now). Google oil consumption with any car brand, you'll be flooded with complaints from almost every car out on the road right now. They say manufacturers did so much to improve fuel economy - including adding low tension rings - it's no wonder engines are burning oil. Add in direct injection and 10,000 mile oil changes?? Most modern cars I'm seeing with over 150,000 on the clock are experiencing oil consumption to some degree (especially direct injection cars).

PREMIUM gas for me!
I own and keep all my cars until they start "nickel and diming" me so I go to great lengths to "pamper" them for years of service so "IF" the engineers who designed them say to run a premium blend of gas I listen to them, because they are highly qualified about what is good for the engine....... When you do the math it costs "a little more" to keep the car happy and running the way it should.
Engine knock is bad and it is the way your engine is telling you that is not happy.

The ls460 engine has 11.8 compression ratio. That’s very high. Using low octane subjects the engine to constant detonation that after the engine sees it the motor tries to compensate for. I am not surprised that some regular users are reporting oil use early.

i hope they buy a car in the future that has had the motor possibly damaged from improper fuel. Some one is buying theirs. Only fair