Why is my fuel consumption so much less than others???

[Simply_Someone]

Looking at the vehicles in my garage--they are not modified--I feel like an outlier and I have a hard time understanding why. I don't do any extreme hypermiling. Drive near the speed limit or above. I regularly check tire pressure and run the maintenance schedule set my the manufacturer. I accelerate moderately to lightly most of the time, but I am also frequently froggy(revving all the way through power band).

I have found several other Fuelly users with Mk7 EA288 Manual Golf TDI's that are near what I have been recording; but, move on a few years and with the purchase of a 2019 1.4T Jetta I am on the far upper end of the distribution with others that appear to be in warmer climates than me as they don't seem to have winter MPG drop-- except, shout out to booth44 who is somewhere in Canada with 6 times the mileage ran as me and sticking strong at 43MPG.

I keep going back and forth on the value a PHEV like the Hyundai Ioniq might have, with some massive hesitations. Can I expect to land on the upper end of the MPG distribution curve there as well. If I can reasonably expect 55-60 mpg after the battery charge has depleted, the math make sense.

Most of my driving is rural, through smaller towns and on freeway (usually flat, sometimes large hills) to destinations in urban areas close to freeway exits. I tend to not idle a lot (get in and go, park and walk-in vs sitting in drivethroughs), but I don't turn off the engine at lights or anything extreme.

The Jetta has been most impressive when I have had highway trips, cruising between 70-80MPH round trip I usually exceed 50 MPG on the trip efficiency. I even considered ditching the TDI because the fuel efficiency of the Jetta has been so stellar, but I definitely prefer the flat torque curve on freeways.

I would definitely be within in battery range for 50% of my daily round trip commute (56mi) and have the engine for extra errands. I figured run the engine in the cooler mornings for heating and such, then when up to operating temperature PHEV the rest of my day.

So, the big question is, for those long trips can I expect to be on the right side of the distribution curve with the Ioniq and see 10-20% better fuel efficiency than the Jetta or is the hybrid system something that will take me from top 25th percentile to the middle of the pack?