I was able to average 32.84602283 miles per US gallon, 39.446445 miles per imperial gallon.

5 weeks on the road driving 8795.65 miles driven 20 fills city and highway driving plus mountain, desert and plains driving

Average per tank imperial gallons
36.059
40.482
43.661
36.139
38.283
45.498
40.372
37.854
46.799
33.26
36.972
38.391
39.035
41.981
36.575
39.542
42.487
41.329
40.332
41.08

Usually drove the speed limit plus 5 to 10 mph

Lifetime mpg Includes winter months of up to -40

No disrespect but calculating your mileage on one or two tanks is nearly meaningless as it is near impossible to fill to the same level. It is all to easy to overfill an extra gallon or to under-fill a similar amount.

I find that if I can fill with the driver's side of the car low I can get an extra 2 gallons in. To get reasonable numbers you should average over at least 5 tanks.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles