Two quarter-pounder burgers cost $3.20 x 2 = $<<3.20*2=6.40>>6.40.
Two large fries cost $1.90 x 2 = $<<2*1.9=3.80>>3.80.
Two milkshakes cost $2.40 x 2 = $<<2*2.4=4.80>>4.80.
The total amount spent for the burgers, fries, and shakes is $6.40 + $3.80 + $4.80 = $<<6.4+3.8+4.8=15>>15.
Therefore, he should order $18 - $15 = $<<18-15=3>>3 worth of additional food to take advantage of the free food delivery.
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