[sciphi]

Do you fill up at the same station all the time or hop around? I've gotten some tanks of bad gas before, and fuel economy did drop like a rock.

 

[sciphi]

Have you checked your tire pressures lately? Did you hit anything that might have thrown the alignment off? Are you carrying more cargo/passengers than you used to?

Another thing is that your E0 gas got diluted down to E10. That would cause a drop in fuel economy.

 

[sciphi]

Try a different gas station. If nothing else changed except maybe the fuel, change the fuel.

Also, dump a bottle of Gumout Regane or Chevron Techron Concentrate into the tank. It'll clean up any gunk that could possibly be in there.

 

[sciphi]

How are you calculating the MPG? Are you going by the DIC, or by miles traveled divided by gallons in?