Dunno DV. sounds like you had a real bad day. The South is notorious for nasty bugs - we just have yellow jackets, black wasps, 'skeeters and flying teeth (black flies) but for sure they can do a job on you too. I got nailed on the right arm cleaning out under the deck last year by those yellow SOB's. Not sure how many times, but enough so I couldn't bend my arm without aches for a week.
PS - The gas mileage - no better. Guess I'd better suck it up and put those ten $12/each plugs and $4 each boots I've had for a year in it - but don't think that will help either.