Join Date: Sep 2014
Location: Charlotte Metro area
Thanked 97 Times in 65 Posts
Doing the math, which assumes I filled the car to the same level at the beginning and the ending, that the Odometer is accurate, and the pump is accurate, I have gotten just above 40 mpg on several trips from Charlotte to Atlanta, and back. BUT, I have to stay under 75 mph. And, no hard starts on the ramps. No big winds. No rain. A/C about half of the time. Even driving a bit harder with A/C all the time, I still get about 38-39 mpg on this round-trip route.
Oh, BTW, I find my computer varies above and below measured by no more than about 1 mpg either way. It's not consistently high or low. Again, this assumes the car is filled exactly the same (may be hard to do), and that the pumps are calibrated the same...no way to verify.
Oh, another point...that 40+ mpg is without Cruise control on this route. With CC, I always lose at least 1 mpg. I let her run a bit faster down the hills, as long as the instant mpg stays at least 45 mpg, and that helps my overall average speed stay up around 73. At the top of the steepest hills, I'm probably down to 70 most of the time. I am hitting over 80 on the steepest downhills as long as the traffic is conducive to that speed. I will say, more people pass me than I am passing, even though I'm well over the posted speed limit.
I just checked my average MPG that I keep on another site. I have 23,000+ of the 49,000+ miles tallied...average is 34.8 mpg. My wife has driven the other half of the miles, so, I don't have those records.
"Synthetic" is a marketing term, not a scientifically significant definition.
Last edited by Blackheart; 12-19-2016 at 05:43 PM.
Reason: clarity, overall mpg info