For Altis 1.6
1zrfe 1.6 engine
4 speed conventional automatic gearbox
No chrome grill and extended chrome bars in headlights
No fog lights
No navigation
Infotainment system is different
No trunk tray
No jacknife type key
No steering controls
Gli like meter
No airbag
No auto retractable mirrors
No split fold rear seats
Chrome garnish are not present on some areas of body and interior as well including the steering wheel
No cruise control
For Altis 1.8 cvti cruisetronic
as compare to Altis 1.6
2zrfe 1.8 engine with cvt automatic transmission
Chrome grill with chrome bars extending into lights
Fog lights
Chrome garnish on door handles and doors
Retractable mirrors
Jacknife type key
Trunk tray
Split fold seats
Tiptronic
New meter
Chrome garnish in some areas of interior
Infotainment system with navigation
Better speakers
Cruise control
Eco indicator
Single air bag for driver
Steering controls on both sides
Meter sweep
Altis 1.8 grande as compare to Altis cvti cruisetronic
Sunroof
Paddle shifters
Climate control
Height adjustment for both front seats
Rain sensor
Leather seats
Fog light chrome garnish
Automatic retractable side mirrors on lock/unlock
Dual airbags
......
I have also noticed that fuel economy of 1.8 variants is better than 1.6 ones.
I own Altis 1.8 cvti cruisetronic new may model. Mine gives 12-13 within city and 15-17 on long routes.
You can confirm all these features from indus motor website brochure of Grande. All the specs are given there.
Here is the link http://www.toyota-indus.com/grande/
Just click on download brochure and look at the specifications. All the models are compared there.
In the end, you don't need to visit shop aka dealership
PS: No shop sells a car, maash ki daal shaed mil jaye 
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