[Avalon MPG]

Had the Charcoal cannister replaced and since then MPG has dropped from 32 MPG Highway down to approx 25 mpg Hwy

also when passing many "Your speed is" signs it appears that I am driving slower than the sign indicates e.g. Sign says 42 mph and speedo says 45 mph and I'm wondering if the odometer is under performing and when I've driven a reported 300 miles it was only say 250 actual?

[Gas Odour]

Hmmm...bad head gasket...maybe. Is it running warmer than usual? Does it run cool on the expressway and then heat up in town?

Found the problem it was a hose [pushon type] that had been pulled free when the air filter was changed

Happy Motoring.

[Gas Odour]

Yeah, octane booster is a scam. Yes, it helps a little, but the with the price you pay for it, you may as well step up and buy the next grade of fuel. Or just forget about the whole thing and drive with the regular gas. I think if you check your owners manual, it will say something like "use regular fuel; for improved performance use premium".

Thanks for your time

I used premium since I got the car and got mpg of 32.85 Hwy but due to the price rise i switched to regular and used the Booster from Dollartree for $1 a bottle and now get the same 32.8 mpg

[Gas Odour]

Hmmm...bad head gasket...maybe. Is it running warmer than usual? Does it run cool on the expressway and then heat up in town?

Thanks for your time,Temp is normal all the time I am beginning to suspect the EVAP system

[Gas Odour]

1999 Avalon runs fine on Hwy but when at stop sign or at lights a smell of gasoline enters the car if outside air is on.Have been using reg gas for some 9 months plus a bottle of octane booster occasionally for a MPG of 32.85 HWY. Have checked for fuel leaks but none found any thoughts out there?

Thanks and happy motoring.