What's you average speed?
My average drops as low as 8-10mph in the worst of it (over 14 miles or so of commute).
That makes it hard for me to match my NEDC City figure of 22MPG US, but usually I pretty well match it, or slightly better it (A/C off).
Normally, I average 20mph and my last tank averaged 38MPG. So half the speed, half the MPG.
Best trips with no traffic I've managed a few times is 50MPG over the same routes.
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