I just did a 600-mile roundtrip from Vancouver, BC to Portland, OR. Since my normal driving consists of 100% city driving here in Vancouver, it's nice to see what my car can do once in a while on the freeway.
I got 41mpg in my auto 98' Corolla. Quite pleased with that. I did a similar trip last year and got 37mpg. The only difference this time is a partial lower grill block, and 35psi max sidewall instead of the recommended 30psi.
It was the hottest weekend of the year (100+degrees F) and we had to blast the A/C on recirculating 90% of the time. I was a bit worried about the grill block, but the temperature needle stayed at the halfway point as usual.
I tried to stay 3 seconds behind big rigs whenever I could, but the scenery gets really boring. My question regarding drafting is this: when faced with the choice of 65mph behind a big rig, or 55mph open air, which is better? I don't have a Scangauge and I realize the results are probably different for different cars. But as a general rule, what should one do in this real world situation?
Attached image of my grill block. Cardboard and black tape.
zimagold 
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