Depends, my problem with Waze and to a lesser extent google was that it would regularly pick routes that would waste a lot of gas trying to sneak out a route, while also not factoring in traffic lights. Stopping and getting up to surface highway speed over a long drive guzzles gas quick. When prices spiked earlier I decided to do some testing with my once a week commute to Piscataway from Pt.Pleasant. And once all was said and done comparing the Parkway and 18 I was actually spending around $3 more on 18 because of the brick wall that is New and East Brunswick.