Okay...I am a total newbie, and just got my '92 VX...on my first tank of gas and starting a fuel log. I'm also considering doing the grill blocking trick to boost the mpg some. This may be a dumb question -- but I was considering putting some of the OEM mudflaps on the VX and wondered if this might be an aerodynamic no-no? Anyone had any experience with this, or is it truly a non-issue?