frozen ccv give bad gas mileage?
 

is it possible that a bad ccv that is freezing up in the winter months give bad gas mileage? right now I`m getting 13.7 l /100km city and in the winter was about 17l/100km city.

Winter gas has a different blend than summer gas, and mpg will suffer.

Symptoms of bad ccv can be rough idle, oil consumption, oil smoke on startup and loss of mileage. Worst case is engine lockup.

Not by 20%.

Summer fuel blend AND running AC knocks my full tank city miles from low 400s in the winter to around 350 in the summer. Almost a 20% reduction.

Ya more like 12.5% :)

Also, in winter the drive in the city is MUCH slower, more frequent & longer stops at red lights, plus some idling. This on top of different fuel. So it could add up to 20% or better.

P.S.: plus the car drives longer with the engine at non-operating temps until it fully warms up.

Very intrigued by your conclusions. Care to share your factual results which brought you these conclusions?

Maybe you misread? He's getting worse gas mileage in the summer.

Typically cars get better gas mileage in the summer.

mine did all the above lol. this winter.

I hope you missed out on the worst case... Hydro lock is nothing to lol about. I've never experienced it, but it's messy and/or expensive.