Ask for thinnest tolerable oil when you change oil next. That is one thing that affects FE, and you don't get a chance to change it every week. If synthetic, better, but it cuts deeper in the wallet. Clean up junk in the boot. Take off any silly overhead rails/carrier/spoiler and clean out the boot. Lighter the better.
(Feels nice here to be on the other side, as I have mostly been asking stuff rather than telling ;-)
And I run my tires at 50 PSI, even when my guru Pale here is a bit shy admitting to his figure :P
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