How much different in mpg?

I never put premium and don't want to start. I don't feel any vibration. And here the diff is 20cents. Just trying to see if it's worth it since I don't "race". I hardly even touch the SPORT.

 

What kind of MPG difference should I expect? I know it's a luxury car and I shouldn't be expecting fantastic mileage, but the higher the better.

 

you drive a Lexus man... treat it right.

 

I always use super and preferably from a Exxon, Shell, or BP they usually have less ethanol than others. I also drive the car in sport mode I average around 20 miles per gallon.

 

this.

The added cost by using "Premium" will offset the MPGs you lose by putting in 87.

 

i always run 93 and try and never put any gas with Ethanol and get 28MPG with my 430...

 

Yes!!! Treat it right!! Don't put regular in ur car plz!!! It's not worth it.. Spend the extra 3 dollars when u fill up ur tank!! Like they said, u have a 50k dollar car man..don't give it water when it's asking for milk!!!

 

i dont even use regular in my Aviator and it has 112k on the clock now...

 

You get better mileage with higher octane fuel. That's natural.

Plus, your engine will run cooler as higher octane fuel burns slower.

 

I use 93 my car has never even seen midgrade. I care more about how the car drives as opposed to mpg. the car is much more responsive in sport mode so that's where it stays.

 

I've been running premium in my '07 GS350 AWD since I bought it a few weeks ago. I just checked the mpg and it said the tank avg was 13mpg?Does this sound right? My wife drives the car back and forth to work each day which is about 8 miles round trip. All other driving is done in the city, no highway at all.

 

What octane should I use for a 2006 GS 300?

I have been told to put in regular and see if it knocks. If not, should be fine.
What do you use?

Thanks

 

Premium, the manual states 90+ octane I believe so you should never put regular in your GS.

 

https://www.clublexus.com/forums/gs-...f-premium.html

 

Use premium, that's what the engine is tuned to use. It's all about the right fuel for the compression ratio.

Even if you put lower octane fuel, the computer will do things like retard timing and likely add more fuel per cycle and run less efficiently but it will run "fine" unless something is horribly wrong or the fuel is worse than can be adjusted for. Correct me if I'm wrong but you would never get knocking from putting a lower than rated octane fuel in, it actually sets up the conditions for a pinging situation.

Pinging is when the fuel "pre-ignites". High octane fuel burns more slowly, hence, why it is needed for a high compression engine. When a gas is compressed, it heats up, sometimes so much so that it can ignite before the spark. In fact, this is how diesel engines work.

Knocking is when the fuel does not burn fast enough.

Anyway, really... if buying premium gas is breaking someones budget I wonder why they would buy a car like this in the first place.