Malaysian Airlines MH370 contact lost

[Jonfra]

Please could somebody guide me, or correct me if I am wrong, but I estimate if MH370 reached FL350 @ 17:07 UTC the fuel remaining was 97,550lb and then given a further 5 minutes cruise to a minute flying beyond IGARI leaves 96,363lb fuel.

Then we are told it descended to 5,000ft and flew west until next seen at 18:02 UTC over Pelau Perak climbing @ 23,000ft. Thus MH370 covered 289nm from IGARI to Pelau Perak making a dog leg around the south of Penang in 40 minutes at full power and performing 433kt TAS?
... At low altitude?

Flying for example at 10,000ft at full power/310 KIAS would equate something like 1,350lb per engine/minute. Therefore in 40 minute segment MH370 burned 54,000lb?

So by the time it reached Pelau Perak at 18:02UTC MH370 had fuel remaining of 43,550lb and then commenced a 20 minute climb back to 29,500ft at MEKAR covering 154nm and burning say 12,000lb?

So by the time it reached SANOB where MH370 is supposed to have made its turn south to intercept the Southern Arc, MH370 had just 31,550lb fuel remaining to cover another 5.5 hours to the Southern Arc flying at 35,000ft with a fuel flow of 9,900lb/hr?

In other words at the time it turned past the tip of Sumatra it had fuel remaining for just 3.2 hours but is supposed to have flown another 5.5 hours?