Welcome to ecomodder, Dave !
If you want that done without mods you'll be rather limited in the kind of car you can get.
Take a look here
EcoModder Fleet list - EcoModder.com
scroll down to below 100mpg to weed out the electric conversions etc. and see what you can get from which vehicle.
First column is the vehicle, if you click on it, you can see what mods were done to it.
Just about everyone's car here is modded in some way or another
