I took my Mirage to the east-coast beaches and scored a whopping average of 56 MPG on the 290 miles round trip (according to the MID).
The mileage steadily dropped from 60 MPG while I was homing in to beach proximity, which I believe was due to the cross winds. I took a relaxed drive and did the usual 55 MPH or 65, when 65 was allowed. As usual, my Mirage was the slowest car on the road, but I believe nobody got too pissed because the highway was not too busy (Actually, is there anybody respecting the posted speed limits in the US?). I had to break hard once, because a speed freak misjudged his trajectory when he cut into my lane; he would have pushed my little ride off the road. Incidentally, a couple of miles later, there as a big accident with tipped over pick-up trucks and two passenger bussed included. From time to time, I had to pull to the fast-lane and let a tail-gating semi truck pass me right hand side (they are making me nervous when they are coming too close). The bright side: I've done the same trip with my Mustang a couple of months back and I had to fill up twice. Now, I have still about half a tank left :-)
The first leg of the drive was very hot and wet (around 90F) and I've tried to play with fan and windows to get the cooling right. In retrospect, I think, I should have given the AC a try, but I was curious as to how much cooling is actually needed and can be done with fan only. The windows are only good, when the speed is below 40 MPG, or they cause too much noise otherwise, even when they are not fully down.
My GPS was sucked to the dash board and was firmly held in place the whole trip.
I drove without break the 3 hours to the beach and have to say that, while, the seat was comfortable, I would have loved a better solution for the legs and arms. I've used my clutching leg as an armrest and put my elbow on my knee/thigh. The right leg hurt after some time, because I have no cruise control and had to maintain some gas level throughout the drive. I then put the leg as far right as possible and could suppress the pedal with a leg angle of more than 120degrees, without having the heel on the floor. I was happy that there were some red lights in the way, which I used to move the legs a little and to relax them. I made extensive use of the cup holder and they worked fine and were accessible.
The way back was in drizzle but without major issues. The same problems with legs and arms were bothering me, of course, but a 15 minutes break at half the distance, helped a lot.
This was also a test run for the planned summer road trip, which will be a 1k+ miles adventure. For me, even 300 miles is a long trip, since my typical commute to work is about 14 miles round trip.
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View my fuel log 2014 Mirage DE 1.2 manual: 47.8 mpg (US) ... 20.3 km/L ... 4.9 L/100 km ... 57.3 mpg (Imp)