Went for a drive to Eastern Washington. A drama & something of interest played out. The drama was I came up on an horrendous accident. I saw two vehicles ripped up badly. People slowed quickly, & I was on my brakes moderately, then considerably. The car in front of me, disappeared into a queer brown smoke that matched the brown terrain. Braking harder, I glimpsed his brake lights & knew I wouldn’t rear end him. Easing off my brakes, I didn’t want anyone re-ending me. Glancing across the freeway, then I saw a tilted semi-trailer off the freeway with the cab jack-knifed. & that was causing the thick smoke. PS... Just looked up the accident on the internet. A pickup & vehicle towing a trailer collided in the west bound lanes (lanes I was in) & punched into the Jersey barrier in the west bound lane. The barrier bowed into the east bound Jersey barrier, which was driven into the nearest east bound lane. The involved semi collided with a car, both trying to avoid the barrier. The semi sent the car off the freeway & into a lake. All people in the car were OK & got out of the lake. I never saw the car in the lake. The cause of interest, occurred during my east bound drive. After passing over 4000 foot Stevens Pass & later climbing a 2600 foot ascent toward Waterville, Washington, I pleasingly saw that my MPG was building nicely, eventually giving 44MPG. However, I noted earlier, scrub brush was bent, being blown strongly by a 15 to 20MPH steady westerly. Once I started moving west bound, I said my MPG will be much less....& it was. My west bound MPG got as low as 32MPG. It eventually recovered, but my west bound trip over the lower 3000 foot Snoqualmie Pass ended at 37.4MPG. Wind to ya!!! PS.... All the vehicles going 10 to 15MPH faster than me, must have been getting low20’s MPG (teens?). Oh well.....gas & go!