Perhaps start with the obvious. 82,000kms is slightly under the average km's a 5 year old car normally as. Perhaps over the years the car has had many 'short trips' & items such as the spark plugs are a bit fouled from (even though they say you can go over 160,000 kms!) not reaching operating temperature or the fuel injectors are gummed up. I got my 01 ES with 72,000 kms but had the Lexus dealer do a complete 'major' tune up on the car before I took delivery with records (and they returned the old spark plugs back to me as well) to prove. Perhaps something simple my do wonders for the sluggish performance of the car. Just my 2 cents B) Keep us posted