I chose the Tucscon 1.6 turbo petrol because I think it has the best specification in technical terms. After 200 km, I realised the small four-cylinder engine doesn't allow for much responsiveness. I had to keep the Sport function on all the time to get enough power, but even then only at high revs. I was having to fill up all the time. I found the solution with your tuning box, which has reconciled me to my car. Excellent acceleration and power at all engine speeds. Though the price initially put me off, I quickly forgot the investment, I'm so pleased with it. Fuel consumption is back below 9L.

Graig J (Glasgow, Scotland)