Hi guys i hope you can help me more i try to solve this problem for 3months now i have this issue. My lexus is200 1999 193 000km started to have high fuel consumption 3 litres more then normal and it has less power and last week i find out first i buyed fuel on Shell and i had consumtion around 10litres normaly by that speed i had 8,5 after my tank was empty i filled up on Avanti fuelstation and i had consumption 11,5 litres by the same speed, i changed oil, airfilter, yesterday i changed sparkplugs so i had to disconnect the battery from ECU after i changed the plugs connected the batter i had better feeling by driving my car today it was again back where it was high consumption less power output, i had no faulty codes in my ECU i did the check a month ago. And i rly dont know where should i look for the problem some idea ? I would like to ask if there exist some list of every sensor values that are correct that i can maybe check this values and maby find some they are not as they should be. Thanks