I watched a video on YouTube, where the speaker showed how the ICE has essentially plateaued in terms of efficiency with regards to emissions and mileage. I'm sure they can squeak a bit more mileage, but it's not anywhere near as dramatic as say, 15 years ago.
My wife's 2013 VW Sportwagen 6 speed manual TDI gets 52 mpg and my 2014 Sportwagen auto TDI gets 44. I had a 2003 Jetta TDI manual that got 52 as well.
It would be nice if there were more diesel cars still being produced.
