I had a flat passenger/front. I had Les Schwab swap in whatever they said was appropriate for my Civic hybrid, the cheaper $50 one. I can't remember the name offhand and I know I'll forget to check later. I've had maybe 750-1,000 miles on it now and I've noticed absolutely no change in my mpg.

...because you'll see me passing everybody at 90 miles per hour going up mountains.