We had few Mpower customers asking about tesco 99, Been in touch with tesco about it but only mainly down south at mo. Read big article at work about it which they were using all top 98ron and tesco's 99, BP ultima came out top easy. Using mk5 golf gti and bmw m5. On gti using ultima gave out 5bhp and 10lbft torque more than optimax and 10lbft torque over tesco99 bhp was same. Very suprising that ultima gave more torque than sanuco racing fuel which the type they tested was £350lt by 4lbft, But less bhp by 6. Normal fuel ultima pissed on them with tesco 2nd and optimax 3rd.