Should CRX HF get more than 45 mpg?

[GasSavers_kermit]

I have a 89 CRX HF, fresh rering, aluminum flywheel, aluminum underdrive pulley, AEM cam gear set to 0*, megan racing header, no cat, 2.25-2.5" ss exhaust, stock intake, 205/40R16 tires on aluminum rims, fiberglass hood.

I babied it on my last tank of gas. Barley accelerating, tons of tailgaters, shifting with the shift light. Cruising 60-65mpg, holding speed around corners. The best that I could get was about 45 mpg.

My commute is a lot of highways with a few stop signs, but I do have to go through town were there are several stop signs and lights.

The thing rolls great, hardly any rolling resistance, no stuck brakes.

I will say that I have added some weight to it with the sway bar, strut brace, sub, and I had to add my own seats so they aren't the super light HF ones. There is a little toe out, but like I said, rolling resistance is pretty good.

It was running good at the time, it wasn't raining at any time during that tank. I have no engine lights. I run regular through it (87 octane). The only thing that I think is that I might switch back to the stock manifold at some point because I've heard that the big diameter tubes could be causing me to lose low end torque and therefore mpg.