Why did MPG drop 2015 toyota Avalon. Bad gas?

Asked by Peter Sep 08, 2021 at 09:37 AM about the 2015 Toyota Avalon XLE Touring

Question type: Maintenance & Repair

2015 Toyota Avalon 6 cylinder (not hybrid) 20k miles. Mileage shown on computer display dropped from 18.6 to about 15 recently...



When purchased new in 2015 city, hwy mileage was always about the same via the computer, 30 mpg on highway trips of decent length and 18.6 (give or take decimal point) city stop and go short runs.


Tire pressure always correct. Air filter changed yearly hardly dirty. Oil changed 3 times since purchase, which means it had new oil when purchased and then 3 changes since.


Tires new on front as of 2 year ago. Battery less than 1 year old. Air filter  60 days old.


So took a 14 hour trip one way and MPG per display was bout 30 mpg as expected. Same on way back.


With last fill up since trip the MPG in city / running errands drop from my expected 18.x to 15. I reset the computer and then changed to Sport and Eco mode and back to normal, which I read online to do. I always run in normal mode. Only had 1 fill up since trip and put on about 120 miles.


Perhaps bad gas?


Hate to throw money in fuel injection or something else if it is an anomaly....


Any thoughts?


Thank you very much

Peter

2 Answers

Bad gas is a possibility. Perhaps it is time for a tune up and to clean the intake system.

Your Answer:

CarGurus Experts

  • #1
    Farmboy93
    Reputation
    2,410
  • #2
    MsAngie1968
    Reputation
    1,340
  • #3
    GuruDCW7P
    Reputation
    1,130
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Toyota Camry
49 Great Deals out of 952 listings starting at $2,212
Used Lexus ES
6 Great Deals out of 197 listings starting at $4,500
Used Honda Accord
44 Great Deals out of 907 listings starting at $2,799
Used Lexus LS
25 listings starting at $11,900
Used Toyota Highlander
25 Great Deals out of 712 listings starting at $6,495
Used Toyota RAV4
79 Great Deals out of 2,040 listings starting at $3,499
Used Toyota Corolla
120 Great Deals out of 1,950 listings starting at $1,995
Used Toyota 4Runner
14 Great Deals out of 328 listings starting at $9,900
Used Lexus GS
21 listings starting at $6,995
Used Toyota Tacoma
55 Great Deals out of 1,032 listings starting at $8,708
Used Lexus IS
26 Great Deals out of 343 listings starting at $5,800
Used Honda Civic
159 Great Deals out of 3,391 listings starting at $2,230
Used Acura TLX
23 Great Deals out of 451 listings starting at $10,999
Used Toyota Tundra
50 Great Deals out of 1,126 listings starting at $5,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.