quick transmission question

Could a transmission slipping (very mildly for now, and not all the time) result in TERRIBLE gas mileage? I mean, I drove about 8 miles the other day and the gas guage actually moved some. I've actually noticed this bad mileage for some time even before the transmission started acting up. Any ideas? Things to check out? Thanks! (btw..If it matters it's an automatic tranny)

I wouldn't think that a lightly slipping transmission would drastically affect fuel economy.

Be careful here, you should really be measuring your fuel economy based on the amount fuel consumed, not looking at your gauge or your OBC display.

You might even have a soft failing fuel pump causing fuel transfer problems between the tank halves.

See 2nd & 3rd link in my signature. Check and watch fuel levels. After 1/2 and less your drivers side tank should empty pretty quickly.

If for some reason you still have a lot of fuel in the drivers side tank, time for a fuel pump and filter.

FYI, if you have any significant trans slippage, you will get the orange cog of death on the dash!

Originally Posted by jfoj

Be careful here, you should really be measuring your fuel economy based on the amount fuel consumed, not looking at your gauge or your OBC display.

You might even have a soft failing fuel pump causing fuel transfer problems between the tank halves.

See 2nd & 3rd link in my signature. Check and watch fuel levels. After 1/2 and less your drivers side tank should empty pretty quickly.

If for some reason you still have a lot of fuel in the drivers side tank, time for a fuel pump and filter.

FYI, if you have any significant trans slippage, you will get the orange cog of death on the dash!

Thanks! I'll check out your links...And it's good to know that if I get any real transmission slippage I'll see the "orange cog of death"!