1] Mechanical/Electrical baseline first: No assumptions that systems are good until checked thoroughly.
2] Smart Use: Combine all trips. Go to farthest point first via freeway if possible, and work back to house
3] Smart driving: The reduced number of annual miles driven better.
My rather recently retired 1971 big block Chrysler could achieve 14-16 mpg in town. Nearly 19 on the highway. And it weighed, with driver, full fuel and permanent gear aboard 4,780-lbs.
Were I you I'd start there: what's it weigh?
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