highvoltag

I did the math today after 3 tanks of 87. Here's the background if you care. If no, skip to the next paragraph. I purchased my CPO '15 in February. I used only 93 or higher fuel until 3 fill ups ago. About 2 weeks.

Anyway, before I switched to 87, I ended up getting about 28MPG according to the car. After switching to 87 it dropped to 25 then up to 26mpg today. It was almost 80. So I switched back to 93. After 100 miles of the same type of driving I do everyday, I got 30mpg. So I did the math. With current fuel prices, I get 68 more miles on a full tank with 93 octane.

After all the other math, it equates to such a small difference in total cost per mile.

PREMIUM ALL THE WAY. Do the math.

alex1372

Today's gas prices in suburbs of Chicago are $3.19 for 87 octane and $4.09 for 91 octane... Whooping 90 cents per gallon difference.

So in your example, filling up about 15 gallons with 87 would cost you $47.85; filling up with 91 will set you back at $61.35; difference of $13.50
Per your calculations 15 gallons on 91 would take you about 420 miles away at 28 MPG; 15 gallons on 87 will get you 375 miles at 25 MPG - in another words to get 420 miles on 87 you would spend $53.59 - Still about $8 cheaper that filling up with premium.

I'm not against premium but it depends on personalities. I don't have a NX yet but I'm looking for CPO with options that I want and color combo and I most likely I will fill it up with premium. For last 6 years I'm driving RX400h and just a week ago (LOL) I found that Lexus requires premium ( https://lexus2.custhelp.com/app/answ...xus-vehicle%3F ) for it - I get 27.5MPG on 87 average over 6 years, way better than EPA estimates of 24/26

Roscol

worldcat

Just wondering if i drive 20k a year is the Hybrid worth it?

lkrekerl

Всем привет Подскажите
, есть ли смысл всегда заправлять бак 93?
Я из России, у нас октановое число 95 и 100 (по вашим данным это 91 и 93)
У меня lexus RX300 (двигатель 8AR-FTS с турбиной)

Lex2000TL

Если инструкция к машине говорит что 93 бензин рекомендуется, то его не обязательно использовать. Можно заливать 87-й. Но, как я понимаю, у вас такой же двигатель как и у нас в NХ200т или NХ300. Этот двигатель с высокой степенью сжатия и требует 93-го бензина. Если лить 87, в итоге можно повредить двигатель. Кстати, с 87-м, мощность двигателя ниже а расход бензина выше, по сравнению с 93-м. Сам пробовал. Ниже, ссылка на двигатель. Удачи.
https://www.motorreviewer.com/engine...inum%20pistons.

lkrekerl

Yes, you have this engine in the nx300 and 200t.
In Russia, the instructions indicate that it is necessary to refuel fuel in accordance with the research method 95 or higher.
Your manual says that you need to fill in 91 (according to the research method, the octane number is 96) or higher.
Would it be better to fill out 93 in this case ? (according to the research method, the octane number is 98 (in Russia, this is the octane number 100 according to the research method).
Or will it not completely burn out and overheat the engine ?

Lex2000TL

Little explanation below, but please search forum for more details, if you will.

Octane number indicates gas ability to resist spontaneous and premature combustion / explosion from compression in cylinders.

Gas/ air mixture in cylinder does not burn instantly (like explosion), but over period of milliseconds, all while piston is moving down. Low octane gas, if used in high-compression engine designed for high octane gas, will explode and not burn in controlled process. If gas/air mixture does not burn but explodes (due to gas not resisting heat from compression), it will produce hard blow (aka knocking sound). Over time these “blows” will damage your engine bearings (crankshaft and wrist pin).

Use gas with octane number per car manual. Using gas with number higher vs stated in manual makes no impact on engine performance or gas mileage, and is waste of money. I mentioned that use 93 simply because in the US area where I live, 91 is not common. We typically have 87, 89 and 93.