I tried an experiment today because I still don't think my van is getting good gas mileage. I drove around for awhile making sure the van was fully warm max temp according to scan gauge F204. Driving on the highway at about 45MPH I was averging 28mpg on using the current trip. When I exited the highway and came home my final mpg average was 17.5. Not very good. N-E ways I'm gonna try a grill block mod once I get some plastic. Do you think the van will get too hot? I'm in Southern Mississippi.