pklex

Naval air...your case is almost same as me...got my 2006 from a 80 yr old lady for whom it was getting unmanageable. ....with 50k miles on it.

given this one has one of the lowest wind drag....does its great coasting is a function of that or lrr tires?

Also the OEM Dunlop sport is a lrr tire?

thanks all for the enlightening and educative(at least to me) discussion above ....wondering whether tire selection will add any to the mileage(say low rolling resistance...etc..) though the heavy the car is ....not sure what the ding on safety that would be .....

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.

Very Interesting read .....I am in the same boat ...just acquired an used 2006 LS 430 and wondering what can I do to boost mileage...so thanks a bunch upfront for sharing .....my only question to you .....did you do all these changes one at a time and checked the mileage or the improvement is an output of the combined change?