Records. (FUELLY app)
How long will you keep it?
How many miles will it cover in that interim?
What percent (of engine time) will be spent off-pavement?
Generally, the higher average mph, the better will be the average mpg. Learn to use those as tools to model driving behavior.
It’s all part of the total cost of ownership & operation. Use AAA or Edmunds to get a start. One needs to have all costs in view. You may not have depreciation costs, but your repairs and vehicle time out of service will be large).
Start there.
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