Naval Air

For several years on 3 different Lexi I blended 2/3 (93) with 1/3 (87) to yield the (91) recommended octane. Since Biden I have changed to 50% (93) and 50% (87) to yield (90) octane and have noted no Milne or performance issues. Interestingly (90) octane is highest octane rating in Alaska.

GDixon, thanks for your post! I get your points but they lead me to believe the points in my post were not clear and thus require a bit of clearing up. First and foremost, the 90.96 Octane blended fuel is the recommended 91 Octane fuel and WILL NOT knock, triggering the knock sensor to !Removed! the engine timing (de-tuning as you say). Mileage and performance will be IDENTICAL to that of the lexus LS430 owner pumping 100 tankfuls of 93 octane fuel a year while saving $505.00/year at today's costs not just $ 227.00/year, as with the 50/50 89 and 93 blend (91 Octane) I first mentioned. The LS 430 engine has no mechanism to sense and up-tune or advance timing with 93 Octane fuel in the tank so anything over 91 octane gains you NOTHING! Second, MPG (see my previous posts) is a game (passion) with me and any monetary savings, if any, are just ancillary pluses. However, , at your encouragement, now that I look at it more closely a $505.00 year ($2525 in 5 short years) savings will MORE than keep me in tires, brakes, oil changes, additives, car washes, detailing,windshield repairs, etc. So I must say, YES, this now makes a great deal of sense to me also. Naval Air

Since filling the 22.2 gallon LS 430 tank with 93 octane premium at its premium price gives you nothing in additional performance or MPG, many drivers with a mind toward economy opt to use a mixture of 50% 93 octane premium and 50% 89 octane plus to achieve the desired exact 91 Octane at an overall lower pump price. For additional savings another option is 65% 93 octane and 35% 87 regular which yields a 90.96 Octane blend which will not knock, trigger the knock sensor and !Removed! the timing with the resulting reduction in performance and MPG. I currently get the same 30 MPG with A/C blowing at 70 mph on the highway with this 35%/65% blend as with 50% 93 octane/50% 89 octane blend while enjoying a $2.27 net savings per tankful. I have made and use the following chart to aid me in achieving the desired 65%/35% blend when refueling the 22.2 gallon tank, pumping premium first! 1/4 tank.............3.66 gal. premium 93 and 1.86 gal. regular 87 1/2 tank.............7.32 gal. premium 93 and 3.74 gal. regular 87 3/4 tank............10.98 gal.premium 93 and 5.67 gal. regular 87 full tank............14.64 gal. premium 93 and 7.56 gal. regular 87 Enjoy! Naval Air

When will I learn to look on the LS430 forums before doing "anything" to my wonderful car. I likewise cleaned my MAS this past week with the CRC Mass Airflow Sensor cleaner. As I have a K&N air filter installed, upon seeing the amber air temperature sensor atop the two MAS wires I thought what I was seeing was a globule of oil from the K&N filter, Oh NO!. Thanks heavens for Google as I quickly found a picture of a Lexus MAS showing that the amber air temperature sensor was part ot the mechanism. Likewise I now see its picture here on the forums. If you are cleaning your MAS you must be interested in MPG so you might enjoy my posts on MPG. I was getting 29.8 MPG Highway at 70 MPH on my 2005 LS430 BEFORE I cleaned the MAS which I must admit did not appear dirty in the least.

If I lived in Saudi Arabian and had to contend with sand storms I would seriously consider not utilizing the K&N air filter that I'm confident contributes 1-1.5 MPG to my high 29MPG highway mileage. Along with to maximize mileage I also avoid obviously dusty enviornments (construction sites, substandard roads etc.) and regularly add 8 oz of Marvel Mystery Oil ( Upper Cylinder Lubricant) at fillup to MINIMIZE wear associated with any particles that get past the K&N before they are quickly exhausted.

I didn't find when looking on TireRack.Com that the OEM Dunlop SP 5000 was specifically a LRR tire. I believe however that my airing up to 35PSI reduces the rolling resistance of the tires. In reading about LRR tires the ads usually suggest the the FUEL SAVINGS will be realized over the life of the tires and won't give you the immediate and measurable improvement of from +3-5 MPG I gained by installing a K&N air filter in the air box and replacing the stock Denso plugs with the Denso Twin Tip Iridiums. Unmentioned in my previous posts regarding high MPG results was the fact that I used the McGuires clay bar kit to restore the finish to a glass like surface, read SUPER SLICK!. That plus the fact the the car has a inherently low coefficient of drag all worked to the good.

Yes, low rolling resistance tires are certainly a meaningful part of the high MPG game, and they don't undully compromise safety, or they wouldn't be sold. The 2005 LS 430 I'm getting the super highway MPG out of was purchased in early November, 2014 from the Baton Rouge Lexus dealer with only 33,500 miles on it. It had been owned by an 84 year old man since new, who replaced the tires with OEM Dunlop SP 5000 from the dealer when they got to be 10 years old, even the SPARE. I trust these tires are low rolling resistance tires as when I let off the gas there is no immediate sensation of deceleration what-so-ever. To test it I let off the gas at 60 miles per hour on level terrain and coasted a full mile before coming to a stop.

Just to be clear my 29.7 and 29.8 MPG results were calculated by dividing the miles driven by gallons pumped. In each case the fuel was topped off at the beginning and end of the trip. My wife and I were in the car with luggage going and added antique purchases in the trunk on the return trip. In both cases the trip computer was not optimistic as it showed in the high 28 mpg range. In my first post regarding mileage I reported replacing the plugs with Denso Twin Tip Iridium's, see Densott.com/iridium, which I believe gave me +1.5 MPG over the stock Denso plugs. You mention temperature which in the previous tests I suspect was slightly detrimental to my results as temps were on the cool side. I look forward to this summer when I can run the milage test SOLO at +90 F, no wind, with the A/C blowing at 70 MPH on Interstate 10 and achieve the expected 30 MPG which I am clearly inching up on!

I didn't make the above tests until all of the items except changing the transmission fluid were done. I realize that the approx. 100 mile range above is open to discussion as to exactly what I now get on the highway so a much longer highway trip to Mobile, AL from Baton Rouge, LA and return the weekend of February 8, 2015 may settle any argument. GOING: 239.8 miles,68 degrees F, 65 MPH on cruise, no A/C, 4.04 hour duration, Average 59 MPH, 8.066 gallons, no head or tail wind, 29.7 MPG ! RETURN: 240.6 miles, 73 degrees F, 70 MPH on cruise, A/C 1/2 of trip, 3:50 hour duration, Average 63 MPH, 8.082 gallons, no head or tail wind, 29.8 MPG ! I have a history of driving Diesel powered cars and always striving for milage so it was only natural that I'd try it with the LEXUS. Given the current low price of gasoline my current approx. 7 cents per mile fuel cost on the LS 430 is remarkable!

I have taken my newly acquired 2005 LS 430 to an amazingly highway fuel efficiency level by simply doing the following things available to any LS 430 owner. 1) Aired up the OEM Dunlop SP 5000 tires to 35 PSI with Nitrogen to stabilize pressure against temperature variations. 2) Replaced stock air filter in air box with exact fit K&N air filter from Amazon.Com. 3) Replaced stock Denso plugs with Denso Twin Tip Iridium plugs from Jegs.com. Visit Densott.com/iridium. 4) Replaced stock Lexus Synthetic blend oil with Royal Purple 5W30 100% synthetic oil in crankcase. 5) Replaced stock Lexus differential oil with Royal Purple 75W90 100% synthetic oil. Here are my ACCURATE results with premium fuel 93 octaine Tip Topped Up at beginning and end of trip and miles driven divided by gallons pumped on same route 3 different times. 1) Distance 96 miles, 52 degrees F, 60 mph mostly some 65 mph all on cruise, 2.449 gallons, pumped 31.4 MPG! 2) Distance 99 miles, 66 degrees F, 65 mph on cruise, 3.449 gallons pumped, 30.6 MPG! 3) Distance 100 miles, 66 degrees F, 55 mph on cruise, 2.99 gallons pumped, 33.4 MPG! Looking forward to changing the stock transmission fluid in the sealed transmission soon with Royal Purple 100% synthetic with the anticipation of more, if only slight, improvement in MPG.

Thought I'd share my excitement at acquiring my NEW 2005 Lexus LS430 with members of the club. Early last month I went to the local Lexus dealer looking for an '07, '08 or '09 LS460 that I figured would be in my price range. They had two, a '07 with 96,000 miles on it and a '09 with 56,000 miles but neither was my preference of white which I disclosed. The salesman then said that they had recently taken in a, loaded, white '05 LS430 that a wealthy 84 year old man had bought new from them, that had had ALL services done there, even an OEM Lexus battery and (5) brand new OEM Dunlop SP Sport 5000 Tires. That's right the SPARE too! The car was PRISTINE inside and out, had only 33,500 miles on it, indicating it obviously had been in a closed garage for most of its 10 year life. Most amazingly it STILL SMELLED NEW! So, I saved myself over $10,000 by buying this CLASSIC and just to be safe, since it was just under the10 year age limit, I was able to put a 3 year, 36,000 mile Lexus Platinum Extended Warranty on it. Could Not Be Happier! Naval Air

I just QUICKLY reattaching the rear sun screen on my 2005 LS 430 even though the how to answers on the net indicated that it was virtually impossible while the frame was installed in the car, should be done by the dealership, or to prepare yourself for a $2,000 replacement cost as it was only sold as a complete unit. HERE IS HOW: Using the perfect tools "(3 )Bosch Basics 6" Spring Clamp with Flex" (EBAY) or equivalent and with the screen frame in the UP position loosely secure the screen to the top of the frame, Left, right and middle ( So you can quite fighting it!). With the Mono Line pulled completely out just the very top of the screen material fits into the TIGHT groove in the top of the frame which is then too large pull out when the Mono Line is run through it internal to the groove. Working from the left side, facing the rear window, slip the monofilament line about 1 to 2 inches into the top most edge of the screen and then slip the end of the screen into the left most side of the frame groove, starting just inboard of the vertical part of the frame where the groove is wide enough to accept the screen with the Mono Line inside. Carefully line up the top of the screen as you press more of the top of the screen into the groove L to R while feeding in the Mono Line. Check, before proceeding, after a few inches that the screen is now secured in the groove and move the clamps as needed to straighten the top of the screen to accept the mono line as You feed in more. If the Mono Line gets stuck, pull out an inch, straighten out the screen, and begin again, this is going to happen. I found that as I got the hang of it that the feeding of the Mono Line itself feed the top of the screen into the groove were the Mono Line then kept it from slipping out. Naval Air