Yup, bigger capacity will take more A/F too.Where did you find this person? I wanna go visit the site and troll him.
If both cars were to go uphill at the same rate, the 1.5 is not going to go further just because of displacement, it'll just have less effort going uphill. The rate of fuel burning is exactly the same assuming all factors are the same. In fact, if anything I think the 1.5 will burn more assuming the 1.3 doesn't bother trying to accelerate harder to go faster.
And what the hell is "pressure of the wind"?
Wind Pressure aka wind resistance.....