I have 26000 miles on my 2014 volt. Went in to fix a leak in rear tire. The shop told me I have excessive wear on both front tires. Probably needs alignment. Went for alignment and it was perfectly aligned. They said maybe low tire pressure. Never had a notice of low pressure in front tires. I was notified of low pressure in rear tire. That's why I went in. Is this a tire problem or a car design flaw?