Consistent over 41MPG highway with Civic
I have about a 270 mile drive from home to school that I'll probably perform like once a month over the next year (x2 to come back of course). It's for the most part interstate or at least pretty open highway, though I do drive through some smaller cities along the way. On the drive home for Labor Day I calculated over 41MPG, and everyone told me "no that's crazy, the pump stopped too soon, next time it will be much lower," etc. But on the return trip yesterday I even broke 42MPG!
I did a lot of driving with load up the shorter hills, though on the really long ones I had to bite the bullet and use cruise control at like 63-64MPH. On flat areas I used cruise control at 65MPH or if the speed limit was 60 or 55 (it was just around the cities) cruise control at the limit. I did a lot of engine-on coasting, down hills, to decelerate for an exit or a lower speed limit, etc. The only "mod" besides my driving was inflating the tires to like 38PSI, just under sidewall max of 40PSI. AC was on the whole time, but the fan on its lowest setting.
Overall I just wanted to thank you guys, because otherwise I'd just have had the cruise control at 75 the whole time, burning it up going up hills and stuff without thinking about it, and probably getting like 34MPG. You can see about my vehicle in my sig.
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