Regular or Premium Gasoline Required?
04-17-17, 04:13 PM
#107
Wow! This thread is really long for such a simple answer. RX350 runs on regular unleaded. Anything higher is just throwing money away. The car is not tuned for higher octane, so there will be no benefit from it. The RX450h recommends premium. You can get away with running lower octane, but to get the most out of your vehicle, use premium.
It's as simple as that.
It's as simple as that.
04-17-17, 05:37 PM
#109
Wow! This thread is really long for such a simple answer. RX350 runs on regular unleaded. Anything higher is just throwing money away. The car is not tuned for higher octane, so there will be no benefit from it. The RX450h recommends premium. You can get away with running lower octane, but to get the most out of your vehicle, use premium.
It's as simple as that.
It's as simple as that.
04-17-17, 06:06 PM
#110
Advanced
Thread Starter
Then, aside from the debate in this forum about whether premium improves power/torque/mileage, a real benefit of using premium should be a cleaner engine, yes?
04-17-17, 06:14 PM
#112
The recommended fuel relates to achieving the marketed and specified EPA mpg and hp torque numbers. It doesn't mean the engineers put ceilings on the timings. I'd be very disappointed if Lexus engineers are doing that.
if they said 87 "required" perhaps one could be sure there is a ceiling on the timings.
if they said 87 "required" perhaps one could be sure there is a ceiling on the timings.
No car states Regular Fuel Required, as higher octane will not harm the engine, just your bank account.
04-17-17, 06:16 PM
#114
04-18-17, 02:05 AM
#116
Pole Position
The dealer fills you you tank with regular and you may continue to do so.
04-18-17, 04:53 AM
#117
With you, it is. I'm now seeing why this thread is so long. Believe what you want. I can't stop you from wasting your money.
The following users liked this post:
ggebhardt (04-18-17)
04-18-17, 05:53 AM
#118
[QUOTE=615tpc;98385.if they said 87 "required" perhaps one could be sure there is a ceiling on the timings.[/QUOTE]
You are right! Lexus engineers did not put a ceiling, but they did pit a floor level, below which one shouldn't go and that's 87. Stands to reason that 87 being the absolute minimum 91 would be better, engineers did not say not to go above....octanes yet I'm always amazed at how people interpret this, they seem to read this minimum as a must and only.
You are right! Lexus engineers did not put a ceiling, but they did pit a floor level, below which one shouldn't go and that's 87. Stands to reason that 87 being the absolute minimum 91 would be better, engineers did not say not to go above....octanes yet I'm always amazed at how people interpret this, they seem to read this minimum as a must and only.
04-18-17, 06:37 AM
#119
There is a technical document on Tacoma World regarding the 2GR-FKS engine. Google it and you will see the valve advance maps and technical data. The exact programming is, of course, trade secrets, and not in the document. Direct injection engine technology has pretty much eliminated pre-ignition of gasoline compared to the standard days of port fuel injection -- I know the 2GR-FKS uses both, but when engine is warmed up, it uses mainly GDI and goes through a cleaning cycle via the PFI during idle periods.
Someone should just dyno their RX using 91+ and 87, unplugging the battery between runs to reset the sensor and on-board RAM. That way this discussion will actually have better data than a "butt-dyno". Right now it is conjecture on both sides.
Someone should just dyno their RX using 91+ and 87, unplugging the battery between runs to reset the sensor and on-board RAM. That way this discussion will actually have better data than a "butt-dyno". Right now it is conjecture on both sides.
