Good day to all tsikoteers!

I'd like to ask if there is a possibility that i'll manage to save gas by having my car's ECU reprogrammed similar to be the Optra gas consumption.

My car is old but is still in good condition, its a 94 toyota corolla GLi with 4A-FE engine, but recently, i've come to notice that my gas consumption is way too much for me.

I've also come to notice that the consumption changed from july this year.

Spark plugs, change oil, timing belts even engine oil treatments, ive done last month but nonetheless, the consumption didn't change.

Is there a need to check the engine? Do I need overhaul?

Thanks.