I live in the Santa Cruz MOuntains, and I've been running a blend of minimum 50/50. SOmetimes I even go as high as 70 veggie, 30 diesel. It works just great, no hesitation on start up, and the car LOVES it. Runs smoother and quieter. I'm out of veggie at the moment and put straight diesel in the tank, I freaked out for a minute listening to my car run because I thought there was some problem because it sounded so clattery! THen I remembered I wasn't running veggie in it anymore.