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I have a grill block that covers at least 3/4 of the openings, and my engine temperatures are totally normal. The electric fan kicks on maybe a couple of times a year more than it might otherwise, and various bits like exhaust headers *might* be hotter, but the engine has never overheated.
Modern engines use thinner oil like 0-20W or 5-20W, and I very much doubt that using thinner oil makes any difference to the FE.
And almost all the time that I EOC - I bump start, so only when I shut off the engine at a stoplight do I use the starter. I've got over 150,000 miles on my xA and still on the original clutch and starter.
I've saved probably 1,500 gallons of gas, so even with buying two sets of video cameras and monitors, I've come out way ahead by ecomodding and ecodriving.
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