Quote:
Originally Posted by Ecky
Does the LS400 call for high octane fuel? Be aware that higher octane gas has marginally less energy per gallon, so all else being equal, your fuel economy will be slightly worse. Many newer vehicles can advance the timing a bit and (partly) offset the extra fuel costs with higher octane gas, but it's almost never cost effective.
To answer your question though, the device you're looking for is the "MPGuino". There's a subforum dedicated to it here in the instrumentation section.
|
I have always ran this Lexus on 91 octane which the owners manual says to use in it. I did find 91 octane ethanol free gas and used it once, but they charged almost $4.00 a gallon for it here. I found 88 octane ethanol free for under $3.00 a gallon and have been using that for two months. My car runs great on the 88 octane ethanol free.
This car is rated at 21 MPG on the highway from the U.S. Department of Energy fuel economy.gov website. I am getting 21 MPG overall with my long 80 MPH highway commute. Slowing the car down to around 65 MPH using a MPGuino should result in better than that.
I used to get 38 MPG on this same exact commute in my Honda Civic HX driving it 75 - 80 MPH on the highway. 50% of the cars on the freeway are now doing 75 MPH or faster here in Utah. The I-15 posted speed limit where I normally drive is 70 MPH. People are driving faster here in the last year on the highways than I have ever seen except for stop and go rush hour traffic which is also far more stop and go this year due to far more cars on the road now than ever before. I generally drive with the flow of traffic in the fast lane or the lane to the right of the fast lane which really is around 80 MPH.