Before my rear locked up, I had 4.10's. I was doing about 2800 RPM's at 80mph with my 18 inch wheels. People may argue this point but I swear to you that I averaged better gas mileage with my 4.10's then I do now with the stock 3.27's. I only drive a 20 mile, highway, round trip to work and I was able to fill up my tank every thursday, but rarely drove on weekends and I drive the piss out of my car....but then again with the 4.10's you can drive the car at 35 mph in 5 gear and dont have to downshift out of 5th to pass on the highway. IMHO you wont feel that much of a difference with the 3.73"s to justify the price of parts and install. Go with the 4.10's I miss mine everytime I drive my car. Traffic IS NOT AN ISSUE because you can start from a dead stop in second gear or if its "crawling traffic" just leave it in first dont break at all and let the sucker coast, or if ur an auto...why worry at all.