hi folks, i<ve just pumped 80pounds of diesel(15 gallons) into my 2008 kia sedonna which igot nearly 430/450 miles from the previous time i refueled so thats 28/29 miles per gallon( me thinks) , we only mainly use this car for caravanning we also have a small town car , i would like to just have 1 car that does 40/45 miles per gallon and can tow owe bailey burgundy @ 14400kg owe budget15/20k...thanks...hasbo