View Poll Results: What gas do you put into your 2RX?
Premium
0
0%
Medium
0
0%
Regular Unleaded
0
0%
Voters: 0. You may not vote on this poll
Do you need Premium Gas in the 2RX (merged discussion threads)
01-06-12, 07:13 AM
#511
I just looked up "Boglehead". No, I am not. Interesting site, though. My background is Finance - investment banking, then Fund management, and now I just manage my money and that of certain others. All along, offering help in analyzing, structuring and completing various transactions/ "deals". You?
01-06-12, 07:20 AM
#512
Pole Position
http://www.bogleheads.org/
01-06-12, 08:33 AM
#514
Pole Position
I agree we've gotten off topic. But a little plug for smart investing, with no profit motive, is a good thing. Anyway, I'll stick to my 89 octane cheaper-than-93-octane gasoline!!!
01-09-12, 06:23 PM
#520
Nope
Unless your regular is an (evil) ethanol blend and your premiun is not an ethanol blend (and your tank was empty when you put the premium in), what you describe CANNOT be a consequence of using premium. The BTU content of the two fuels is identical. Premium will have higher octane and if you have a high comprerssion engine that you are flogging, it will perform better than it would with regular with the ignition timing "bumping off" the knock sensor. Premium may also have a better detergent package, but you would have to have a pretty dirty engine (from bad regular use) for that to make a difference and it would not happen as quickly as you describe.
What you describe cannot happen. Sorry.
- nopcbs
What you describe cannot happen. Sorry.
- nopcbs
Hey everybody, I had my RX down to Thompson Lexus for a wheel alignment and had some C best settings done. They gave me a brand spanking new Silver RX 350 with 18 miles on it to use 
. On the way home it was struggling to get 18mpg on the display. Before I left to pick mine up the next day, I put in around 5gal of Premium fuel and the trip down is around 47 miles one way. The read out going down read 21 mpg`s, now that my friends, is why I use Premium fuel. Not much difference in power, but a definite difference in mpg`s. BTW, they only put regular fuel in their vehicles. They leave it up to the customer to decide which fuel to use.
. On the way home it was struggling to get 18mpg on the display. Before I left to pick mine up the next day, I put in around 5gal of Premium fuel and the trip down is around 47 miles one way. The read out going down read 21 mpg`s, now that my friends, is why I use Premium fuel. Not much difference in power, but a definite difference in mpg`s. BTW, they only put regular fuel in their vehicles. They leave it up to the customer to decide which fuel to use.
01-09-12, 11:59 PM
#521
Unless your regular is an (evil) ethanol blend and your premiun is not an ethanol blend (and your tank was empty when you put the premium in), what you describe CANNOT be a consequence of using premium. The BTU content of the two fuels is identical. Premium will have higher octane and if you have a high comprerssion engine that you are flogging, it will perform better than it would with regular with the ignition timing "bumping off" the knock sensor. Premium may also have a better detergent package, but you would have to have a pretty dirty engine (from bad regular use) for that to make a difference and it would not happen as quickly as you describe.
What you describe cannot happen. Sorry.
- nopcbs
What you describe cannot happen. Sorry.
- nopcbs
01-10-12, 06:58 AM
#522
Lexus Champion
Sure it can, and it does. I dont know what year you have, but run three tanks of regular, and do the mpg math. Then run three tanks of premium, and again do the mpg math. I`m willing to bet you will see better mpg`s. How much is another story, but their will be a plus to it. Oh,and all of our fuel here has that crappy-*** Ethanol junk in it. Also, this isnt the first time I have done this with their loaners. I Always put premium fuel in their loaner vehicles. Mostly because I want to see if their is any difference. Long story short, their always is. Hey, if your satisfied using Regular fuel, thats your choice. I`m not trying to talk anyone into anything. These are just my personal observances.
Last edited by lexus114; 01-10-12 at 10:54 AM.
01-10-12, 09:36 AM
#524
01-10-12, 03:20 PM
#525
No, I don't play soccer!
I preferred 89 octane in my 300 and 330. Both ran fine for the time I drove them, five and six years respectively. The 450h gets premium only which is 93 octane around here.