Radioactive might bring a hazmat team . . .

...if not your local Homeland Security nazi.

I was kinda thinking this too. I used to think that it would be funny to put a radiation sign on the back of the Prius but the joke might wear off in the even that I wreck and the fire department takes the sign seriously. Probably best to keep away from things that could draw the wrong kind of attention in the wrong circumstances.

why not just slap one of these on and call it good...

https://www.anytimesign.com/images/STUDENT_DRIVER_2.jpg

Better yet (for me): "Caution: The driver is only working on 3-cylinders!"

I too get nervous about people riding my arse, but they just later pass and all is forgotten (that is until I coast up to them at the next light :cool: )

RH77

excellent idea! I've been thinking about something like that since I've slowed my speeds down on the highway. I was thinking something like "save gas, slow down", but your's is much better. Your's doesn't encourage others to do the same, which may enrage some drivers.

Hello -

I was also thinking about a "positive" version :

Follow me for great MPG!

Obviously, you are encouraging people to follow you. The grumpy ones would still bypass you, but your "initial virtual contact" with them would be in the vein of "let me help you".

Here is what I currently do :

https://home.earthlink.net/~cfg83/gas...rear_night.jpg

The letters are not in the GasSavers font because they are reflective (bought 'em in a 99 cent store).
The "A" is a WW II mileage ration. The little toys are probably distracting/disarming too.

CarloSW2

Yikes... We the anti- this one.

https://upload.wikimedia.org/wikipedi...zard_N.svg.png

Or how about a real time display of the cars mpg on an LED matrix in the back window. Then people may understand the benefits of slowing down.

I haven't been able to find the one I first saw for motorcycles, there is a compeny that makes signs that bolt on above or below your lisence plate that come in "40mpg" "50mpg" and "60mpg" I think they might have said "and having more fun then you" or something like that.
but mpgstick.com sells them from 30+ to 80+ mpg as bumper stickers.https://www.mpgstick.com/50.jpg

CafePress also has mpg stickers ranging from

https://images.cafepress.com/product/...x150_Front.JPG

up to

https://images.cafepress.com/product/...x150_Front.JPG

in 1mpg incriments