I can't comment 1st hand about an Onan, but I'm pretty sure I can hear a sucking sound when my 2072 with Mag 20 gets anywhere near a gas station. My great uncle had a 982 that I doubt he would have kept for over 20 years if it was very hard on gas. He was tight fisted that way. Wish I could have bought it, but his son in law got it instead.
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2 Originals, 100, 105, 125, 1450, 1200, 2 IH 982's, 1211, 2072, 2-1864's, 1782, 3 - 42" front blades, 3 Haban 54" blades, Haban sickle mower, BB36, QA-36A, 42" IH rear blade, 42" IH landscape rake, #1 tiller, #40 box blade, 59M shredder, #2 cart, International 3312 push mower, International 250 power washer, 1952 IH refridgerator, 1971 IH 1210 3/4T 4x4 truck
  
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