Ditto. My dash display tells me 14.x in all city stop light grand prix driving.

 

A stop/start system would help you city drivers. Some of those systems from other manufactureres have gotten really good and are barely noticeable.

 

I'd probably turn it off. Barely noticeable is still noticeable.

Coming from a Trans Am, and turbo Subaru, I'm pretty use to 14 mpg

 

I hated that start stop system on the new malibu....I heard it, car would always shake from the engine, and it activated way to much and made it hard to pull away from a light. I'd want a cylinder deactivation system more than that.

 

Stop start on my car with the exhaust would be pretty hillarious.

 

Jaguar F-Type has stop/start. It's positively awful, particularly if you've enabled Sport Mode on the exhaust.

 

Agree, last car would only get around 17-19 on the Highway and around the same in the city. In the G I am seeing around 23-26 on the Highway depending on how fast I am going (70-90).

 

I live about 3 miles from work, but 12 traffic lights exist in my path. If I spend a week going to and from work, city streets, no highway, I average about 15-16mpg. Some weeks I drive back and forth to Orange County, which is 70+ miles each way. I can average 27 mpg on this drive using nothing more than cruise control, averaging 75-80mph. What seems to really kill mileage is putting the trannie in Drive Sport, and jumping on the throttle leaving lights and entering the highway from exit ramps.

Naturally aspirated, 3.7L, high compression, aggressively cammed, port injected motors have never been known to get great mileage. This is why the germans have always taken the approach of using smaller, direct injected, turbo charged engines as they are much more efficient (albeit not as reliable).