Mileage has dropped from 51mph to 33mph!! on 2012 Honda Insight

Recently I had a problem where ABS, Brake System and VSA lights turned on but after check at dealership found out that due to low battery bcoz of no use for a month car had electronic system failure so they reset the system but since then mileage of my car has dropped significantly from being 51 to around 33 also I am feeling sluggishness in the pickup. Any advice guys what could be causing this problem car has 8500 miles on it and I drive around 10miles a day only

by in Buffalo Grove, IL on April 10, 2013
2 answers 2 comments
ANSWER by on April 11, 2013
should be under factory warranty, return and ask questions
COMMENT by on April 12, 2013
sure will do, Thanks!!
ANSWER by on April 11, 2013
Is the IMA system working properly , including 'auto-stop' Is yours manual or automatic trans?
COMMENT by on April 12, 2013
Yes IMA is working and auto stop is also working it is automatic transmission