Good day tsikoteers!

I'm not thinking of buying any of these 2. I just want to share my FC with this 2. When I'm on our Youth Center, our service car is a Revo GL 1.8 M/T and I noticed that it's an effing guzzler car. As in saksakan ng lakas uminom ng gas to the point that it has to be refueled every 3 days. Ang gamit lang niya is almost always around Tagaytay. Last week, I get to drive a Revo GSX 2.0 A/T for a week, same route. I noticed that it is not as guzzler as I expected it to be even though it's automatic. I'm thinking that it might be because of a better power-to-weight ratio since the 2.0L is more potent than the 1.8L tapos they carry the same weight naman.

Can someone affirm or negate this? I might also have a light foot over the gas pedal of the A/T.