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Terrible MPG LS 500: 15MPG???

Old 10-01-18, 03:17 PM
  #31  
mikesrx350
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Thank you for sharing your experience. Mine is back to 15-16mpg range again, 70% city. It has 4000 miles now, is it still considered break-in period? What can I do to improve?

to improve the gas mileage
the factors are throttle response

eco setting instead of normal

no A/C or high temp a/c to cut down on compressor use

the 15 or 16 mpg will not change with 70% or 60% city, the car will get 15 mpg in normal driving around town for short distances

one other factor shell 93 v power or 91 on west coast will get better mpg than chevron or costco

good luck
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Old 10-01-18, 03:50 PM
  #32  
seanspeng
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Thank you Mike!
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Old 10-01-18, 04:43 PM
  #33  
mikesrx350
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thank you sir, you have a beautiful ride i want your car

too much $$$ for me right now enjoy it your a lucky man
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Old 10-02-18, 01:34 PM
  #34  
FatherTo1
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Originally Posted by dsc07 View Post
Ok, that's just a methodology used by the EPA for measuring MGP, which is quite different from a regulation. Lexus is free to default the drive mode to the last mode used, like they did on the 460. But thanks for the links.
The LS 460 only keeps "last mode used" for Eco, Comfort, or Normal. Sport/Sport+ will revert to Normal at the next engine start. Interesting thread about the LS 500 MPG. I expected better MPG improvements when Lexus went to the 3.5L TT V6 for the LS. I am sure the LS 500 is an exhilarating ride though. Enjoy!
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Old 10-02-18, 09:00 PM
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Originally Posted by seanspeng View Post
I bought this used at 2500 miles. When I got it, it showed 14.7 mpg, I thought that was something unusual. I drove 500 miles from San Diego to San Francisco and got 27 mpg average 78mph.

Now back to home, we drive a mixed city and highway, for this new tank (chevron) about 50/50 City/highway, I watched the mpg kept dropping, all the way to now 15.3 mpg. This is beyond miserable. I would expect it to be around 22-23.

Anyone else experienced such a terrible mpg? Could something be terribly wrong and caused it? What should I check?

Thank you in advance for sharing your information.
I'm averaging 22. Only have about 450 miles on it. Mixed driving with a more than a few hard accelerations.
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