What is the gallon count? It reads 18.5 gallons on Google, but I can only get around 12 in there. It sounds like a bit of a rhetorical question, but I am interested to know which one it is. Does this imply that I am broken or that it was altered if it should be 18.5?
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If Google says 18.5 gallons but you’re only getting around 12, it’s not you—it’s probably the tank’s capacity or design. Sometimes, the “18.5 gallons” includes a reserve that you can’t easily fill up to. It’s like having a big glass but only filling it halfway. No worries, you’re not broken, and your tank probably hasn’t been altered. Just a quirk of design
Ah! 
Please check your owner’s manual for the precise details. For instance, my 2006 Ridgeline’s tank holds 22 gallons, however, I can only fill up to 18 gallons, and that’s because the remaining 4-5 gallons are likely reserved for emergencies. Even when the gauge shows empty, there’s still some fuel left.
My 2006 accord was 17.1, but the fuel light would come on at 12. Simply implies you’re filling when you should and not leaving it dry.