Kimi's huge advantage had really shocked me while I was watching the race cos he had lost ground to Alonso when he lost his rear end and spectecularly pointed onto the track. In this video, it's understood pit stop was nearly 6 sec or even less one, which corresponds 12.1 * 6 <= 72 litres for 19 laps remaining. Than it's OK as the fuel burn figure per lap in Hungary is 2.85 litre. Probably Kimi was fuelled even lighter than this number.
Btw, it says in the website "Evans says, "Shell is very proud of the fact that we helped Ferrari reach a strong engine reliability record. By combining Shell V-Power race fuel with a suite of other Shell products, we create a complete package of care for Ferrari’s engine."
The rule that stipulated the same engine for consecutive two races was put in 2005. Ferrari's reliability record was back in 2000's. Begining from 2006 Japan, Ferrari's record was not that good even compared to that of McLaren, which has been very popular thanks to its infamous reliability past.
"I don't want to achieve immortality through my work. I want to achieve it by not dying" -Woody Allen