Here's a data point:
At the Green Grand Prix this year, Toyota provided three exhibition vehicles, driven by sales reps--a 2020 Corolla Hybrid (53/52/52), a 2019 Prius AWD (52/48/50) and a 2019 RAV4 Hybrid (41/38/40). Under the same track conditions and same average speed, the results were:
2020 Corolla Hybrid: 57.0 mpg (+9.6%)
2019 Prius AWD: 54.4 mpg (+8.8%)
2019 RAV4 Hybrid: 39.2 mpg (-2.0%)
Granted, the conditions weren't great (snowing), but the two cars still beating their EPA ratings while the SUV didn't raises some concerns--specifically, it might be harder to beat its EPA.
Why do you assume you can get only +3 mpg in a 2018 RAV4 but +5 mpg in the 2019?
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