sorry for the late reply bro...didnt subscribe so lost track of the thread...yes the deceleration is normal...this car is built that way so that ur accelerating or even free rolling when ur foot is pressing the accelerator not at other times. about ur second problem...yes the average is a bit low coz i get 12 even in the most congested traffic, do these things.
1.Get ur car properly tuned from authorized toyota dealership.
2.Get a brand new and original Air filter.
3.Mobile oil used should be at least ZIC A+
4.Check tire inflation and tires condition.
5.Get ur alignment and balance digital check and rectifications done.
6.Mix in about 6 to 8 litres of hi octane on every tank full.
7.Get ur Fuel filter changed...get the genuine one.
Yes if u lose the remotes it would definitely be a BIG loss..the loacking mechanism serial number wud have to be sent to toyota japan where they will reprogramme two more remotes for u n give u a hefty bill. Better keep em as dear as ur cheque book!