Part of the problem is increased fuel consumption - by approx 10% - they don't tell you that usually.
Not quite true. Yes Ethanol has a lower calorific value than hydrocarbon fuels but it is only about 75% , so if E10 is 10% ethanol by weight then the effect on the total mixture will be approx 3% . Most of us would struggle to measure the difference in real world fuel consumption. There is a lot of dis-information put out there by oil companies who have their own interests to protect.
I gave the prime fuel research testing station in Germany 5 unmarked 205 litre drums of fuels, only we knew which which of them contained ethanol. They could not distinguish between any of them despite running short and medium term tests on both engine rigs in the lab and really world trails with road cars.
I did a lot of work on using ethanol which was distilled from excess wine production and using it in the gasoline pool in the 19980s and 1990s. The oil companies hated it , they don't want to buy in components, and there are real problems in the distribution system where a lot of petrol is stored on water beds, (so the ethanol is absorbed into the water and lost from the fuel) The oil companies wanted it all converted to the corresponding ether ETBE which is more miscible and not leached by water.
Ethanol does burn "cleaner" than hydrocarbon fuels (it has oxygen in the molecule so doesn't take as much from the atmosphere) . In theory the engine should run cooler because of the higher latent heat of evaporation.
However the negatives are the effect on some rubber and other gasket compounds in seals etc, some alloys may be marginally more suseptable to corrosion , and its lacks any lubricating properties.
It has been present in fuels all over Europe for more than a decade now (including the so-called "Super" petrols.
I don't subscribe to theory of food v fuel as most of the ethanol produced for fuel is made from agricultural surpluses (at least in Europe) . Now whether farmers should be subsidised for producing surpluses is another matter entirely and here I would agree.