I wanted to share my experience about tuning the first T-jet petrol. This car produces a whopping extra 28bhp if tuned in the european weather conditions. Our air is warmer and i dont have a dyno to test the exact measure on wheels, but the car took of like a jet, better than the stock for sure. We are tuning with maps that will produce an extra 24 bhp making it a 140hp car. About Mileage drop : my customer doesnt care as of now. With petrol mix going up as you the push the car, i would expect a drop, but not a whole lot; maybe a km or 2, but guys thats performance! you lose to gain some. Alternatively, the driver who uses it more often during the day in the city reports no loss. He is good and drives mainly on low rpm and higher gears without any engine abuse like the owner. About WARRANTY : Trust me! We've not had a single customer who's had any warranty issue! Our maps are tuned at TUV certified centers. We use Piasini Engineering in Italy. Engine maps that are uploaded on stock computer if remapped by a proper tuner wont come in the way of your warranty. The method is very important. We dont alter any stock values. It will always read the same. We download a complete binary (WIN OLS) from your main engine chip and then look at areas of improvement. Our goal is not to make sport cars or rocket, but make them better and more enjoyable. No dealer can ever find out or prove the map were different! Atleast not with the workshop intelligence in India. Questions welcome!