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Depends...The Spitfire(30 mpg having fun or 38 mpg highway) has an 8 gal tank and likes (89 octane) about $3.50/gal here. Work van (16.5-17 mpg) 27 gal reg $3.32/gal. Cessna (20 mpg in cruise) 37 gal...

OK...I have a problem with that though. I have one car that takes 6.5-6.7 gallons ($20) to fill up and one that takes 27 gallons ($100)and the Cessna runs about $225...Which yard stick do I measure...