Ok, so of the first topup I got 9.1/L on the first two days which were mostly highway and then it came down to 8.6/L due to moderate city traffic and then dropped to 8.4/L overall with 550kms done and 60km till empty. With the 95 I averaged 7.8/L (very heavy foot) to 8.2/L which means there not a big difference in mileage. BUT the driving experience has totally changed. The pick-up is much better, there's minimum lag in quick acceleration (quick overtakes), and a little less engine noise. I love the driving experience with the 98, so I'm trying a second re-fill which so far on day 2 is giving me the same reading. Watch this space...