Can you clear the Gas Station awning--Laser Measuring

This last summer I pulled in to a neighborhood chain 7/11 type station located at the intersection of 2 major freeways in Wichita Falls Tx. As Imwas pulling in my wife glanced at our reflection in the store fronts windows and yelled Stop! Just before I was about to hit my front A/C. I hit the brakes and went up the ladderto confirm my clearance since I was almost out of diesel. I did not have a clearance, it was about 8" short. I had to back out onto the freeway service road to go somewhere else.